Compatibility flags · Cloudflare Workers docs

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class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers-ai/get-started/workers-wrangler/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#2-connect-your-worker-to-workers-ai" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">AI ↗</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/analytics/analytics-engine?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Analytics Engine ↗</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/static-assets/binding/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Assets ↗</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/browser-rendering?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Browser Rendering ↗</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/d1/worker-api/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">D1 ↗</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/cloudflare-for-platforms/workers-for-platforms/get-started/configuration/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Dispatcher (Workers for Platforms) ↗</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/durable-objects/api/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Durable Objects ↗</span> </a></li> <li class="astro-3ii7xxms"><a 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Limiting</span> <span class="sl-badge caution small astro-3ii7xxms astro-avdet4wd">Beta</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/secrets/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Secrets ↗</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="39"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Service bindings</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/bindings/service-bindings/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Service bindings"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/bindings/service-bindings/http/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">HTTP</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/bindings/service-bindings/rpc/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">RPC (WorkerEntrypoint)</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/observability/logs/tail-workers/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Tail Workers ↗</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/vectorize/reference/client-api/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Vectorize ↗</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/bindings/version-metadata/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Version metadata</span> <span class="sl-badge caution small astro-3ii7xxms astro-avdet4wd">Beta</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workflows/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Workflows ↗</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/cache/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Cache</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/console/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Console</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/context/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Context (ctx)</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/encoding/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Encoding</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/eventsource/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">EventSource</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/fetch/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Fetch</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="20"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Handlers</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/handlers/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Handlers"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/durable-objects/api/alarms/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Alarm Handler ↗</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/email-routing/email-workers/runtime-api/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Email Handler ↗</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/handlers/fetch/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Fetch Handler</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/queues/configuration/javascript-apis/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#consumer" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Queue Handler ↗</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/handlers/scheduled/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Scheduled Handler</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/handlers/tail/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Tail Handler</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/headers/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Headers</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/html-rewriter/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">HTMLRewriter</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="21"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Node.js compatibility</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Node.js compatibility"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/assert/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">assert</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/asynclocalstorage/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">AsyncLocalStorage</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/buffer/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Buffer</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/crypto/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Crypto</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/diagnostics-channel/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Diagnostics Channel</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/dns/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">dns</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/eventemitter/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">EventEmitter</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/net/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">net</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/path/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">path</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/process/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">process</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/streams/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Streams</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/string-decoder/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">StringDecoder</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/test/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">test</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/timers/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">timers</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/url/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">url</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/util/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">util</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/zlib/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">zlib</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/performance/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Performance and timers</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="22"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Remote-procedure call (RPC)</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/rpc/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Remote-procedure call (RPC)"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/rpc/lifecycle/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Lifecycle</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/rpc/reserved-methods/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Reserved Methods</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/rpc/visibility/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Visibility and Security Model</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/rpc/typescript/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">TypeScript</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/rpc/error-handling/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Error handling</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/request/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Request</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/response/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Response</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="23"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Streams</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/streams/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Streams"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/streams/readablestream/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">ReadableStream</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/streams/readablestreambyobreader/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">ReadableStream BYOBReader</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/streams/readablestreamdefaultreader/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">ReadableStream DefaultReader</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/streams/transformstream/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">TransformStream</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/streams/writablestream/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">WritableStream</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/streams/writablestreamdefaultwriter/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">WritableStream DefaultWriter</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/tcp-sockets/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">TCP sockets</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/web-crypto/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Web Crypto</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/web-standards/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Web standards</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="24"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">WebAssembly (Wasm)</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a 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<div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Static Assets</span> <span class="sl-badge caution small astro-3ii7xxms astro-avdet4wd">Beta</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/static-assets/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Static Assets"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/static-assets/get-started/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Get Started</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/static-assets/binding/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Configuration and Bindings</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/static-assets/routing/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Routing</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/static-assets/compatibility-matrix/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Workers vs. Pages (compatibility matrix)</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/static-assets/direct-upload/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Direct Uploads</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/static-assets/billing-and-limitations/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Billing and Limitations</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="5"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Frameworks</span> <span class="sl-badge caution small astro-3ii7xxms astro-avdet4wd">Beta</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/frameworks/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Frameworks"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="25"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Framework guides</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/frameworks/framework-guides/angular/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Angular</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/frameworks/framework-guides/astro/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Astro</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/frameworks/framework-guides/docusaurus/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Docusaurus</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/frameworks/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Framework guides ↗</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/frameworks/framework-guides/gatsby/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Gatsby</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/frameworks/framework-guides/nextjs/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Next.js</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/frameworks/framework-guides/nuxt/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Nuxt</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/frameworks/framework-guides/qwik/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Qwik</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/frameworks/framework-guides/remix/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Remix</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/frameworks/framework-guides/solid/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Solid</span> </a></li> </ul> </details></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="6"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Databases</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/databases/connecting-to-databases/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Connect to databases</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/analytics/analytics-engine/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" 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astro-3ii7xxms"><span class="large astro-3ii7xxms">Database Integrations</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/databases/native-integrations/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Database Integrations"> <span class="astro-3ii7xxms">Overview</span> <span class="sl-badge caution small astro-3ii7xxms astro-avdet4wd">Beta</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/databases/native-integrations/fauna/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Fauna</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/databases/native-integrations/neon/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Neon</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/databases/native-integrations/planetscale/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">PlanetScale</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/databases/native-integrations/supabase/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Supabase</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/databases/native-integrations/turso/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Turso</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/databases/native-integrations/upstash/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Upstash</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/databases/native-integrations/xata/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Xata</span> </a></li> </ul> </details></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore 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class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Unit testing</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/testing/integration-testing/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Integration testing</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="27"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Vitest integration</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/testing/vitest-integration/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Vitest integration"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="40"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Get started</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a 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class="large astro-3ii7xxms">Changelog</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/platform/changelog/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms" data-group-label="Changelog"> <span class="astro-3ii7xxms">Overview</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/platform/changelog/historical-changelog/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Workers (Historic)</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/platform/changelog/wrangler/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Wrangler</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/platform/limits/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Limits</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/platform/storage-options/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Choose a data or storage product</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/platform/betas/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Betas</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/platform/known-issues/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Known issues</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/cloudflare-for-platforms/workers-for-platforms/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Workers for Platforms ↗</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"> <details class="astro-3ii7xxms"><sl-sidebar-restore data-index="12"></sl-sidebar-restore> <summary class="astro-3ii7xxms"> <div class="group-label astro-3ii7xxms"><span class="large astro-3ii7xxms">Reference</span> </div> <svg aria-hidden="true" class="caret astro-3ii7xxms astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1.25rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg></summary> <ul class="astro-3ii7xxms"> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/reference/how-the-cache-works/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">How the Cache works</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/reference/how-workers-works/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">How Workers works</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/reference/migrate-to-module-workers/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Migrate from Service Workers to ES Modules</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/reference/protocols/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Protocols</span> </a></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/reference/security-model/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="astro-3ii7xxms"> <span class="astro-3ii7xxms">Security model</span> </a></li> </ul> </details></li> <li class="astro-3ii7xxms"><a href="https://developers-cloudflare-com.translate.goog/workers/glossary/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB" aria-current="false" class="large astro-3ii7xxms"> <span class="astro-3ii7xxms">Glossary</span> </a></li> <li class="astro-3ii7xxms"><a 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class="astro-doynk5tl"> <details id="starlight__mobile-toc" class="astro-doynk5tl"> <summary id="starlight__on-this-page--mobile" class="sl-flex astro-doynk5tl"> <div class="toggle sl-flex astro-doynk5tl"> On this page <svg aria-hidden="true" class="caret astro-doynk5tl astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1rem;"> <path d="m14.83 11.29-4.24-4.24a1 1 0 1 0-1.42 1.41L12.71 12l-3.54 3.54a1 1 0 0 0 0 1.41 1 1 0 0 0 .71.29 1 1 0 0 0 .71-.29l4.24-4.24a1.002 1.002 0 0 0 0-1.42Z" /> </svg> </div><span class="display-current astro-doynk5tl"></span></summary> <div class="dropdown astro-doynk5tl"> <ul class="isMobile astro-g2bywc46" style="--depth: 0;"> <li class="astro-g2bywc46" style="--depth: 0;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#_top" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Overview</span> </a></li> <li class="astro-g2bywc46" style="--depth: 0;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#setting-compatibility-flags" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Setting compatibility flags</span> </a></li> <li class="astro-g2bywc46" style="--depth: 0;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#nodejs-compatibility-flag" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Node.js compatibility flag</span> </a></li> <li class="astro-g2bywc46" style="--depth: 0;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#flags-history" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Flags history</span> </a> <ul class="isMobile astro-g2bywc46" style="--depth: 1;"> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#enable-cache-no-store-http-standard-api" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Enable cache: no-store HTTP standard API</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#allow-specifying-a-custom-port-when-making-a-subrequest-with-the-fetch-api" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Allow specifying a custom port when making a subrequest with the fetch() API</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#properly-extract-blob-mime-type-from-content-type-headers" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Properly extract blob MIME type from content-type headers</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#use-standard-url-parsing-in-fetch" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Use standard URL parsing in fetch()</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#returning-empty-uint8array-on-final-byob-read" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Returning empty Uint8Array on final BYOB read</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#brotli-content-encoding-support" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Brotli Content-Encoding support</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#durable-object-stubs-and-service-bindings-support-rpc" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Durable Object stubs and Service Bindings support RPC</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#handling-custom-thenables" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Handling custom thenables</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#fetchers-no-longer-have-getputdelete-helper-methods" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Fetchers no longer have get/put/delete helper methods</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#queues-send-messages-in-json-format" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Queues send messages in JSON format</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#suppress-global-importscripts" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Suppress global importScripts()</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#nodejs-asynclocalstorage" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Node.js AsyncLocalStorage</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#python-workers" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Python Workers</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#webcrypto-preserve-publicexponent-field" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">WebCrypto preserve publicExponent field</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#vectorize-query-with-metadata-optionally-returned" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Vectorize query with metadata optionally returned</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#websocket-compression" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">WebSocket Compression</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#strict-crypto-error-checking" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Strict crypto error checking</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#strict-compression-error-checking" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Strict compression error checking</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#bot-management-data" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Bot Management data</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#urlsearchparams-delete-and-has-value-argument" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">URLSearchParams delete() and has() value argument</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#use-a-spec-compliant-url-implementation-in-redirects" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Use a spec compliant URL implementation in redirects</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#dynamic-dispatch-exception-propagation" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Dynamic Dispatch Exception Propagation</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#headers-supports-getsetcookie" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Headers supports getSetCookie()</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#nodejs-compatibility" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Node.js compatibility</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#streams-constructors" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Streams Constructors</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#compliant-transformstream-constructor" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Compliant TransformStream constructor</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#commonjs-modules-do-not-export-a-module-namespace" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">CommonJS modules do not export a module namespace</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#do-not-throw-from-async-functions" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Do not throw from async functions</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#new-url-parser-implementation" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">New URL parser implementation</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#r2-bucket-list-respects-the-include-option" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">R2 bucket list respects the include option</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#do-not-substitute-null-on-typeerror" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Do not substitute null on TypeError</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#minimal-subrequests" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Minimal subrequests</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#global-navigator" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Global navigator</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#do-not-use-the-custom-origin-trust-store-for-external-subrequests" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Do not use the Custom Origin Trust Store for external subrequests</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#settersgetters-on-api-object-prototypes" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Setters/getters on API object prototypes</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#durable-object-stubfetch-requires-a-full-url" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Durable Object stub.fetch() requires a full URL</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#fetch-improperly-interprets-unknown-protocols-as-http" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">fetch() improperly interprets unknown protocols as HTTP</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#streams-byob-reader-detaches-buffer" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Streams BYOB reader detaches buffer</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#formdata-parsing-supports-file" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">FormData parsing supports File</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#htmlrewriter-handling-of-esiinclude" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">HTMLRewriter handling of <esi:include></span> </a></li> </ul></li> <li class="astro-g2bywc46" style="--depth: 0;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#experimental-flags" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Experimental flags</span> </a> <ul class="isMobile astro-g2bywc46" style="--depth: 1;"> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#htmlrewriter-handling-of-esiinclude" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">HTMLRewriter handling of <esi:include></span> </a></li> </ul></li> </ul> </div> </details> </nav> </mobile-starlight-toc> <script type="module" src="/_astro/MobileTableOfContents.astro_astro_type_script_index_0_lang.CwvHEPnB.js"></script> </div> <div class="right-sidebar-panel sl-hidden lg:sl-block astro-pb3aqygn"> <div class="sl-container astro-pb3aqygn"> <starlight-toc data-min-h="2" data-max-h="3"> <nav aria-labelledby="starlight__on-this-page"> <h2 id="starlight__on-this-page">On this page</h2> <ul class="astro-g2bywc46" style="--depth: 0;"> <li class="astro-g2bywc46" style="--depth: 0;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#_top" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Overview</span> </a></li> <li class="astro-g2bywc46" style="--depth: 0;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#setting-compatibility-flags" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Setting compatibility flags</span> </a></li> <li class="astro-g2bywc46" style="--depth: 0;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#nodejs-compatibility-flag" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Node.js compatibility flag</span> </a></li> <li class="astro-g2bywc46" style="--depth: 0;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#flags-history" class="astro-g2bywc46" style="--depth: 0;"> <span class="astro-g2bywc46" style="--depth: 0;">Flags history</span> </a> <ul class="astro-g2bywc46" style="--depth: 1;"> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#enable-cache-no-store-http-standard-api" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Enable cache: no-store HTTP standard API</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#allow-specifying-a-custom-port-when-making-a-subrequest-with-the-fetch-api" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Allow specifying a custom port when making a subrequest with the fetch() API</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#properly-extract-blob-mime-type-from-content-type-headers" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Properly extract blob MIME type from content-type headers</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#use-standard-url-parsing-in-fetch" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Use standard URL parsing in fetch()</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#returning-empty-uint8array-on-final-byob-read" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Returning empty Uint8Array on final BYOB read</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#brotli-content-encoding-support" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Brotli Content-Encoding support</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#durable-object-stubs-and-service-bindings-support-rpc" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Durable Object stubs and Service Bindings support RPC</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#handling-custom-thenables" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Handling custom thenables</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#fetchers-no-longer-have-getputdelete-helper-methods" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Fetchers no longer have get/put/delete helper methods</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#queues-send-messages-in-json-format" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Queues send messages in JSON format</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#suppress-global-importscripts" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Suppress global importScripts()</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#nodejs-asynclocalstorage" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Node.js AsyncLocalStorage</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#python-workers" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Python Workers</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#webcrypto-preserve-publicexponent-field" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">WebCrypto preserve publicExponent field</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#vectorize-query-with-metadata-optionally-returned" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Vectorize query with metadata optionally returned</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#websocket-compression" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">WebSocket Compression</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#strict-crypto-error-checking" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Strict crypto error checking</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#strict-compression-error-checking" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Strict compression error checking</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#bot-management-data" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Bot Management data</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#urlsearchparams-delete-and-has-value-argument" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">URLSearchParams delete() and has() value argument</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#use-a-spec-compliant-url-implementation-in-redirects" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Use a spec compliant URL implementation in redirects</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#dynamic-dispatch-exception-propagation" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Dynamic Dispatch Exception Propagation</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#headers-supports-getsetcookie" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Headers supports getSetCookie()</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#nodejs-compatibility" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Node.js compatibility</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#streams-constructors" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Streams Constructors</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#compliant-transformstream-constructor" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Compliant TransformStream constructor</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#commonjs-modules-do-not-export-a-module-namespace" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">CommonJS modules do not export a module namespace</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#do-not-throw-from-async-functions" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Do not throw from async functions</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#new-url-parser-implementation" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">New URL parser implementation</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#r2-bucket-list-respects-the-include-option" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">R2 bucket list respects the include option</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#do-not-substitute-null-on-typeerror" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Do not substitute null on TypeError</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#minimal-subrequests" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Minimal subrequests</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#global-navigator" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Global navigator</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#do-not-use-the-custom-origin-trust-store-for-external-subrequests" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Do not use the Custom Origin Trust Store for external subrequests</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#settersgetters-on-api-object-prototypes" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Setters/getters on API object prototypes</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#durable-object-stubfetch-requires-a-full-url" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Durable Object stub.fetch() requires a full URL</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#fetch-improperly-interprets-unknown-protocols-as-http" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">fetch() improperly interprets unknown protocols as HTTP</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#streams-byob-reader-detaches-buffer" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">Streams BYOB reader detaches buffer</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#formdata-parsing-supports-file" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">FormData parsing supports File</span> </a></li> <li class="astro-g2bywc46" style="--depth: 1;"><a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#htmlrewriter-handling-of-esiinclude" class="astro-g2bywc46" style="--depth: 1;"> <span class="astro-g2bywc46" style="--depth: 1;">HTMLRewriter handling of <esi:include></span> </a></li> </ul></li> <li class="astro-g2bywc46" style="--depth: 0;"><a 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astro-7nkwcw3z"><starlight-image-zoom> <template class="astro-vjux6bgf"><dialog class="starlight-image-zoom-dialog astro-vjux6bgf"> <button aria-label="Unzoom image" class="starlight-image-zoom-control astro-vjux6bgf"> <svg aria-hidden="true" fill="currentColor" viewbox="0 0 24 24" class="astro-vjux6bgf"><use href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#starlight-image-zoom-icon-unzoom" class="astro-vjux6bgf"></use> </svg></button> <figure class="astro-vjux6bgf"></figure> </dialog> </template> <svg xmlns="http://www.w3.org/2000/svg" style="display:none" class="astro-vjux6bgf"><symbol id="starlight-image-zoom-icon-zoom" viewbox="0 0 24 24" class="astro-vjux6bgf"> <path d="M9.79 12.79 4 18.59V17a1 1 0 0 0-2 0v4a1 1 0 0 0 .08.38 1 1 0 0 0 .54.54A1 1 0 0 0 3 22h4a1 1 0 0 0 0-2H5.41l5.8-5.79a1 1 0 0 0-1.42-1.42ZM21.92 2.62a1 1 0 0 0-.54-.54A1 1 0 0 0 21 2h-4a1 1 0 0 0 0 2h1.59l-5.8 5.79a1 1 0 0 0 0 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They can be useful if you want to help the Workers team test upcoming changes that are not yet enabled by default, or if you need to hold back a change that your code depends on but still want to apply other compatibility changes.</p> <p>Compatibility flags will often have a date in which they are enabled by default, and so, by specifying a <a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-dates?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB"><code dir="auto">compatibility_date</code></a> for your Worker, you can quickly enable all of these various compatibility flags up to, and including, that date.</p> <div tabindex="-1" class="heading-wrapper level-h2"> <h2 id="setting-compatibility-flags">Setting compatibility flags</h2><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#setting-compatibility-flags"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <p>You may provide a list of <code dir="auto">compatibility_flags</code>, which enable or disable specific changes.</p> <div tabindex="-1" class="heading-wrapper level-h4"> <h4 id="via-wrangler">Via Wrangler</h4><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#via-wrangler"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <p>Compatibility flags can be set in a Worker's <a href="https://developers-cloudflare-com.translate.goog/workers/wrangler/configuration/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Wrangler configuration file</a>.</p> <p>This example enables the specific flag <code dir="auto">formdata_parser_supports_files</code>, which is described <a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#formdata-parsing-supports-file">below</a>. As of the specified date, <code dir="auto">2021-09-14</code>, this particular flag was not yet enabled by default, but, by specifying it in <code dir="auto">compatibility_flags</code>, we can enable it anyway. <code dir="auto">compatibility_flags</code> can also be used to disable changes that became the default in the past.</p> <script> (() => { class StarlightTabsRestore extends HTMLElement { connectedCallback() { const starlightTabs = this.closest('starlight-tabs'); if (!(starlightTabs instanceof HTMLElement) || typeof localStorage === 'undefined') return; const syncKey = starlightTabs.dataset.syncKey; if (!syncKey) return; const label = localStorage.getItem(`starlight-synced-tabs__${syncKey}`); if (!label) return; const tabs = [...starlightTabs?.querySelectorAll('[role="tab"]')]; const tabIndexToRestore = tabs.findIndex( (tab) => tab instanceof HTMLAnchorElement && tab.textContent?.trim() === label ); const panels = starlightTabs?.querySelectorAll(':scope > [role="tabpanel"]'); 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0.111Q19.009 0.111 20.213 1.099Q21.417 2.089 21.417 4.153L21.417 4.153Q21.417 4.540 21.352 5.292Q21.288 6.045 21.288 6.432L21.288 6.432Q21.159 7.249 21.116 8.711L21.116 8.711Q21.159 9.614 21.503 10.087L21.503 10.087Q22.062 10.732 23.438 10.732L23.438 10.732Z" /> </svg> wrangler.jsonc </a></li> <li role="presentation" class="tab astro-esqgolmp"><a role="tab" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#tab-panel-1232" id="tab-1232" aria-selected="false" tabindex="-1" class="astro-esqgolmp"> <svg aria-hidden="true" class="astro-esqgolmp astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1em;"> <path d="m21.32 9.55-1.89-.63.89-1.78A1 1 0 0 0 20.13 6L18 3.87a1 1 0 0 0-1.15-.19l-1.78.89-.63-1.89A1 1 0 0 0 13.5 2h-3a1 1 0 0 0-.95.68l-.63 1.89-1.78-.89A1 1 0 0 0 6 3.87L3.87 6a1 1 0 0 0-.19 1.15l.89 1.78-1.89.63a1 1 0 0 0-.68.94v3a1 1 0 0 0 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data-language="jsonc"><code> <div class="ec-line"> <div class="code"> <span style="--0:#89DDFF;--1:#007474">{</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#89DDFF;--1:#007474">"</span><span style="--0:#C895EA;--1:#7C5B92">compatibility_date</span><span style="--0:#89DDFF;--1:#007474">"</span><span style="--0:#89DDFF;--1:#007474">:</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#FDDA68;--1:#A84E00">"2021-09-14"</span><span style="--0:#89DDFF;--1:#007474">,</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#89DDFF;--1:#007474">"</span><span style="--0:#C895EA;--1:#7C5B92">compatibility_flags</span><span style="--0:#89DDFF;--1:#007474">"</span><span style="--0:#89DDFF;--1:#007474">:</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">[</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#FDDA68;--1:#A84E00">"formdata_parser_supports_files"</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#89DDFF;--1:#007474">]</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#89DDFF;--1:#007474">}</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="{ "compatibility_date": "2021-09-14", "compatibility_flags": [ "formdata_parser_supports_files" ]}"> <div></div></button> </div> </figure> </div> </div> <div id="tab-panel-1232" aria-labelledby="tab-1232" role="tabpanel" hidden> <div class="expressive-code"> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="toml"><code> <div class="ec-line"> <div class="code"> <span style="--0:#A9A9A5;--0fs:italic;--1:#62676A;--1fs:italic"># Opt into backwards-incompatible changes through September 14, 2021.</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#EEFFFF;--1:#00268F">compatibility_date</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">=</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#FDDA68;--1:#A84E00">"2021-09-14"</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#A9A9A5;--0fs:italic;--1:#62676A;--1fs:italic"># Also opt into an upcoming fix to the FormData API.</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#EEFFFF;--1:#00268F">compatibility_flags</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">=</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">[</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#FDDA68;--1:#A84E00">"formdata_parser_supports_files"</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">]</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="# Opt into backwards-incompatible changes through September 14, 2021.compatibility_date = "2021-09-14"# Also opt into an upcoming fix to the FormData API.compatibility_flags = [ "formdata_parser_supports_files" ]"> <div></div></button> </div> </figure> </div> </div> <starlight-tabs-restore class="astro-esqgolmp"></starlight-tabs-restore> </starlight-tabs> <script type="module">class r extends HTMLElement{static#e=new Map;#t;#n="starlight-synced-tabs__";constructor(){super();const t=this.querySelector('[role="tablist"]');if(this.tabs=[...t.querySelectorAll('[role="tab"]')],this.panels=[...this.querySelectorAll(':scope > [role="tabpanel"]')],this.#t=this.dataset.syncKey,this.#t){const i=r.#e.get(this.#t)??[];i.push(this),r.#e.set(this.#t,i)}this.tabs.forEach((i,c)=>{i.addEventListener("click",e=>{e.preventDefault();const 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1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <p>Compatibility flags can be updated in the Workers settings on the <a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://dash.cloudflare.com/" target="_blank" rel="noopener">Cloudflare dashboard<span class="external-link"> ↗</span></a>.</p> <div tabindex="-1" class="heading-wrapper level-h4"> <h4 id="via-the-cloudflare-api">Via the Cloudflare API</h4><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#via-the-cloudflare-api"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <p>Compatibility flags can be set when uploading a Worker using the <a href="https://developers-cloudflare-com.translate.goog/api/resources/workers/subresources/scripts/methods/update/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Workers Script API</a> or <a href="https://developers-cloudflare-com.translate.goog/api/resources/workers/subresources/scripts/subresources/versions/methods/create/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Workers Versions API</a> in the request body's <code dir="auto">metadata</code> field.</p> <div tabindex="-1" class="heading-wrapper level-h2"> <h2 id="nodejs-compatibility-flag">Node.js compatibility flag</h2><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#nodejs-compatibility-flag"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <aside aria-label="Note" class="starlight-aside starlight-aside--note"> <p class="starlight-aside__title" aria-hidden="true"> <svg viewbox="0 0 24 24" width="16" height="16" fill="currentColor" class="starlight-aside__icon"> <path d="M12 11C11.7348 11 11.4804 11.1054 11.2929 11.2929C11.1054 11.4804 11 11.7348 11 12V16C11 16.2652 11.1054 16.5196 11.2929 16.7071C11.4804 16.8946 11.7348 17 12 17C12.2652 17 12.5196 16.8946 12.7071 16.7071C12.8946 16.5196 13 16.2652 13 16V12C13 11.7348 12.8946 11.4804 12.7071 11.2929C12.5196 11.1054 12.2652 11 12 11ZM12.38 7.08C12.1365 6.97998 11.8635 6.97998 11.62 7.08C11.4973 7.12759 11.3851 7.19896 11.29 7.29C11.2017 7.3872 11.1306 7.49882 11.08 7.62C11.024 7.73868 10.9966 7.86882 11 8C10.9992 8.13161 11.0245 8.26207 11.0742 8.38391C11.124 8.50574 11.1973 8.61656 11.29 8.71C11.3872 8.79833 11.4988 8.86936 11.62 8.92C11.7715 8.98224 11.936 9.00632 12.099 8.99011C12.2619 8.97391 12.4184 8.91792 12.5547 8.82707C12.691 8.73622 12.8029 8.61328 12.8805 8.46907C12.9582 8.32486 12.9992 8.16378 13 8C12.9963 7.73523 12.8927 7.48163 12.71 7.29C12.6149 7.19896 12.5028 7.12759 12.38 7.08ZM12 2C10.0222 2 8.08879 2.58649 6.4443 3.6853C4.79981 4.78412 3.51809 6.3459 2.76121 8.17317C2.00433 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href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">The <code dir="auto">nodejs_compat</code> flag</a> also enables <code dir="auto">nodejs_compat_v2</code> as long as your compatibility date is 2024-09-23 or later. The v2 flag improves runtime Node.js compatibility by bundling additional polyfills and globals into your Worker. However, this improvement increases bundle size.</p> <p>If your compatibility date is 2024-09-22 or before and you want to enable v2, add the <code dir="auto">nodejs_compat_v2</code> in addition to the <code dir="auto">nodejs_compat</code> flag. If your compatibility date is after 2024-09-23, but you want to disable v2 to avoid increasing your bundle size, add the <code dir="auto">no_nodejs_compat_v2</code> in addition to the <code dir="auto">nodejs_compat flag</code>.</p> </div> </aside> <p>A <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">growing subset</a> of Node.js APIs are available directly as <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Runtime APIs</a>, with no need to add polyfills to your own code. To enable these APIs in your Worker, add the <code dir="auto">nodejs_compat</code> compatibility flag to your <a href="https://developers-cloudflare-com.translate.goog/workers/wrangler/configuration/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Wrangler configuration file</a>:</p> <p>To enable both built-in runtime APIs and polyfills for your Worker or Pages project, add the <a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#nodejs-compatibility-flag"><code dir="auto">nodejs_compat</code></a> <a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#nodejs-compatibility-flag">compatibility flag</a> to your <a href="https://developers-cloudflare-com.translate.goog/workers/wrangler/configuration/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Wrangler configuration file</a>, and set your compatibility date to September 23rd, 2024 or later. This will enable <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Node.js compatibility</a> for your Workers project.</p><starlight-tabs data-sync-key="wranglerConfig" class="astro-esqgolmp"> <div class="tablist-wrapper not-content astro-esqgolmp"> <ul role="tablist" class="astro-esqgolmp"> <li role="presentation" class="tab astro-esqgolmp"><a role="tab" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#tab-panel-1237" id="tab-1237" aria-selected="true" tabindex="0" class="astro-esqgolmp"> <svg aria-hidden="true" class="astro-esqgolmp astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1em;"> <path d="M0.734 13.269L0.562 10.732Q1.938 10.732 2.497 10.087L2.497 10.087Q2.884 9.614 2.884 8.711L2.884 8.711Q2.884 8.324 2.798 7.571Q2.712 6.819 2.712 6.410Q2.712 6.002 2.669 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</a></li> <li role="presentation" class="tab astro-esqgolmp"><a role="tab" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#tab-panel-1238" id="tab-1238" aria-selected="false" tabindex="-1" class="astro-esqgolmp"> <svg aria-hidden="true" class="astro-esqgolmp astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1em;"> <path d="m21.32 9.55-1.89-.63.89-1.78A1 1 0 0 0 20.13 6L18 3.87a1 1 0 0 0-1.15-.19l-1.78.89-.63-1.89A1 1 0 0 0 13.5 2h-3a1 1 0 0 0-.95.68l-.63 1.89-1.78-.89A1 1 0 0 0 6 3.87L3.87 6a1 1 0 0 0-.19 1.15l.89 1.78-1.89.63a1 1 0 0 0-.68.94v3a1 1 0 0 0 .68.95l1.89.63-.89 1.78A1 1 0 0 0 3.87 18L6 20.13a1 1 0 0 0 1.15.19l1.78-.89.63 1.89a1 1 0 0 0 .95.68h3a1 1 0 0 0 .95-.68l.63-1.89 1.78.89a1 1 0 0 0 1.13-.19L20.13 18a1 1 0 0 0 .19-1.15l-.89-1.78 1.89-.63a1 1 0 0 0 .68-.94v-3a1 1 0 0 0-.68-.95ZM20 12.78l-1.2.4A2 2 0 0 0 17.64 16l.57 1.14-1.1 1.1-1.11-.6a2 2 0 0 0-2.79 1.16l-.4 1.2h-1.59l-.4-1.2A2 2 0 0 0 8 17.64l-1.14.57-1.1-1.1.6-1.11a2 2 0 0 0-1.16-2.82l-1.2-.4v-1.56l1.2-.4A2 2 0 0 0 6.36 8l-.57-1.11 1.1-1.1L8 6.36a2 2 0 0 0 2.82-1.16l.4-1.2h1.56l.4 1.2A2 2 0 0 0 16 6.36l1.14-.57 1.1 1.1-.6 1.11a2 2 0 0 0 1.16 2.79l1.2.4v1.59ZM12 8a4 4 0 1 0 0 8 4 4 0 0 0 0-8Zm0 6a2 2 0 1 1 0-4 2 2 0 0 1 0 4Z" /> </svg> wrangler.toml </a></li> </ul> </div> <div id="tab-panel-1237" aria-labelledby="tab-1237" role="tabpanel"> <div class="expressive-code"> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="jsonc"><code> <div class="ec-line"> <div class="code"> <span style="--0:#89DDFF;--1:#007474">{</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#89DDFF;--1:#007474">"</span><span style="--0:#C895EA;--1:#7C5B92">compatibility_flags</span><span style="--0:#89DDFF;--1:#007474">"</span><span style="--0:#89DDFF;--1:#007474">:</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">[</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#FDDA68;--1:#A84E00">"nodejs_compat"</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#89DDFF;--1:#007474">],</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#89DDFF;--1:#007474">"</span><span style="--0:#C895EA;--1:#7C5B92">compatibility_date</span><span style="--0:#89DDFF;--1:#007474">"</span><span style="--0:#89DDFF;--1:#007474">:</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#FDDA68;--1:#A84E00">"2024-09-23"</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#89DDFF;--1:#007474">}</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="{ "compatibility_flags": [ "nodejs_compat" ], "compatibility_date": "2024-09-23"}"> <div></div></button> </div> </figure> </div> </div> <div id="tab-panel-1238" aria-labelledby="tab-1238" role="tabpanel" hidden> <div class="expressive-code"> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="toml"><code> <div class="ec-line"> <div class="code"> <span style="--0:#EEFFFF;--1:#00268F">compatibility_flags</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">=</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">[</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#FDDA68;--1:#A84E00">"nodejs_compat"</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">]</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#EEFFFF;--1:#00268F">compatibility_date</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">=</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#FDDA68;--1:#A84E00">"2024-09-23"</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="compatibility_flags = [ "nodejs_compat" ]compatibility_date = "2024-09-23""> <div></div></button> </div> </figure> </div> </div> <starlight-tabs-restore class="astro-esqgolmp"></starlight-tabs-restore> </starlight-tabs> <aside aria-label="Note" class="starlight-aside starlight-aside--note"> <p class="starlight-aside__title" aria-hidden="true"> <svg viewbox="0 0 24 24" width="16" height="16" fill="currentColor" class="starlight-aside__icon"> <path d="M12 11C11.7348 11 11.4804 11.1054 11.2929 11.2929C11.1054 11.4804 11 11.7348 11 12V16C11 16.2652 11.1054 16.5196 11.2929 16.7071C11.4804 16.8946 11.7348 17 12 17C12.2652 17 12.5196 16.8946 12.7071 16.7071C12.8946 16.5196 13 16.2652 13 16V12C13 11.7348 12.8946 11.4804 12.7071 11.2929C12.5196 11.1054 12.2652 11 12 11ZM12.38 7.08C12.1365 6.97998 11.8635 6.97998 11.62 7.08C11.4973 7.12759 11.3851 7.19896 11.29 7.29C11.2017 7.3872 11.1306 7.49882 11.08 7.62C11.024 7.73868 10.9966 7.86882 11 8C10.9992 8.13161 11.0245 8.26207 11.0742 8.38391C11.124 8.50574 11.1973 8.61656 11.29 8.71C11.3872 8.79833 11.4988 8.86936 11.62 8.92C11.7715 8.98224 11.936 9.00632 12.099 8.99011C12.2619 8.97391 12.4184 8.91792 12.5547 8.82707C12.691 8.73622 12.8029 8.61328 12.8805 8.46907C12.9582 8.32486 12.9992 8.16378 13 8C12.9963 7.73523 12.8927 7.48163 12.71 7.29C12.6149 7.19896 12.5028 7.12759 12.38 7.08ZM12 2C10.0222 2 8.08879 2.58649 6.4443 3.6853C4.79981 4.78412 3.51809 6.3459 2.76121 8.17317C2.00433 10.0004 1.8063 12.0111 2.19215 13.9509C2.578 15.8907 3.53041 17.6725 4.92894 19.0711C6.32746 20.4696 8.10929 21.422 10.0491 21.8079C11.9889 22.1937 13.9996 21.9957 15.8268 21.2388C17.6541 20.4819 19.2159 19.2002 20.3147 17.5557C21.4135 15.9112 22 13.9778 22 12C22 10.6868 21.7413 9.38642 21.2388 8.17317C20.7363 6.95991 19.9997 5.85752 19.0711 4.92893C18.1425 4.00035 17.0401 3.26375 15.8268 2.7612C14.6136 2.25866 13.3132 2 12 2ZM12 20C10.4178 20 8.87104 19.5308 7.55544 18.6518C6.23985 17.7727 5.21447 16.5233 4.60897 15.0615C4.00347 13.5997 3.84504 11.9911 4.15372 10.4393C4.4624 8.88743 5.22433 7.46197 6.34315 6.34315C7.46197 5.22433 8.88743 4.4624 10.4393 4.15372C11.9911 3.84504 13.5997 4.00346 15.0615 4.60896C16.5233 5.21447 17.7727 6.23984 18.6518 7.55544C19.5308 8.87103 20 10.4177 20 12C20 14.1217 19.1572 16.1566 17.6569 17.6569C16.1566 19.1571 14.1217 20 12 20Z" /> </svg>Note</p> <div class="starlight-aside__content"> <p>As of September 23rd, 2024, the <code dir="auto">nodejs_compat</code> compatibility flag enables the exact same behavior as the <code dir="auto">nodejs_compat_v2</code> compatibility flag, as long as your compatibility date is set to September 23rd, 2024 or later.</p> </div> </aside> <p>A <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">growing subset</a> of Node.js APIs are available directly as <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Runtime APIs</a>, with no need to add polyfills to your own code. To enable these APIs in your Worker, only the <code dir="auto">nodejs_compat</code> compatibility flag is required:</p><starlight-tabs data-sync-key="wranglerConfig" class="astro-esqgolmp"> <div class="tablist-wrapper not-content astro-esqgolmp"> <ul role="tablist" class="astro-esqgolmp"> <li role="presentation" class="tab astro-esqgolmp"><a role="tab" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#tab-panel-1233" id="tab-1233" aria-selected="true" tabindex="0" class="astro-esqgolmp"> <svg aria-hidden="true" class="astro-esqgolmp astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1em;"> <path d="M0.734 13.269L0.562 10.732Q1.938 10.732 2.497 10.087L2.497 10.087Q2.884 9.614 2.884 8.711L2.884 8.711Q2.884 8.324 2.798 7.571Q2.712 6.819 2.712 6.410Q2.712 6.002 2.669 5.185L2.669 5.185Q2.583 4.454 2.583 4.153L2.583 4.153Q2.583 2.089 3.787 1.099Q4.991 0.111 7.184 0.111L7.184 0.111L8.259 0.111L8.259 2.648L7.700 2.648Q6.754 2.648 6.345 3.185Q5.937 3.723 5.937 4.798L5.937 4.798Q5.937 5.056 6.023 5.572L6.023 5.572Q6.109 6.217 6.109 6.561L6.109 6.561Q6.109 6.819 6.152 7.378L6.152 7.378Q6.238 8.152 6.238 8.582L6.238 8.582Q6.238 10.216 5.550 11.033L5.550 11.033Q4.948 11.764 3.658 12.065L3.658 12.065Q4.948 12.409 5.550 13.097L5.550 13.097Q6.238 13.957 6.238 15.548L6.238 15.548Q6.238 16.021 6.152 16.795L6.152 16.795Q6.066 17.354 6.088 17.612Q6.109 17.870 6.023 18.515L6.023 18.515Q5.937 18.988 5.937 19.203L5.937 19.203Q5.937 20.278 6.345 20.815Q6.754 21.353 7.700 21.353L7.700 21.353L8.259 21.353L8.259 23.890L7.184 23.890Q2.712 23.890 2.712 19.848L2.712 19.848Q2.712 18.386 2.862 17.590Q3.013 16.795 3.013 15.290L3.013 15.290Q3.013 13.269 0.734 13.269L0.734 13.269ZM23.438 10.732L23.438 13.011Q21.159 13.011 21.159 15.032L21.159 15.032Q21.159 15.419 21.224 16.171Q21.288 16.924 21.288 17.311L21.288 17.311Q21.417 18.128 21.417 19.590L21.417 19.590Q21.417 23.632 16.859 23.632L16.859 23.632L15.784 23.632L15.784 21.353L16.300 21.353Q17.246 21.353 17.654 20.815Q18.063 20.278 18.063 19.203Q18.063 18.128 17.934 17.569L17.934 17.569Q17.934 17.225 17.848 16.558Q17.762 15.892 17.762 15.548L17.762 15.548Q17.762 13.957 18.450 13.097L18.450 13.097Q19.052 12.409 20.342 12.065L20.342 12.065Q19.052 11.764 18.450 11.033L18.450 11.033Q17.762 10.216 17.762 8.582L17.762 8.582Q17.762 8.152 17.848 7.378L17.848 7.378Q17.934 6.819 17.934 6.561L17.934 6.561Q18.063 5.873 18.063 4.841Q18.063 3.809 17.633 3.293Q17.203 2.777 16.300 2.648L16.300 2.648L15.784 2.648L15.784 0.111L16.859 0.111Q19.009 0.111 20.213 1.099Q21.417 2.089 21.417 4.153L21.417 4.153Q21.417 4.540 21.352 5.292Q21.288 6.045 21.288 6.432L21.288 6.432Q21.159 7.249 21.116 8.711L21.116 8.711Q21.159 9.614 21.503 10.087L21.503 10.087Q22.062 10.732 23.438 10.732L23.438 10.732Z" /> </svg> wrangler.jsonc </a></li> <li role="presentation" class="tab astro-esqgolmp"><a role="tab" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#tab-panel-1234" id="tab-1234" aria-selected="false" tabindex="-1" class="astro-esqgolmp"> <svg aria-hidden="true" class="astro-esqgolmp astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1em;"> <path d="m21.32 9.55-1.89-.63.89-1.78A1 1 0 0 0 20.13 6L18 3.87a1 1 0 0 0-1.15-.19l-1.78.89-.63-1.89A1 1 0 0 0 13.5 2h-3a1 1 0 0 0-.95.68l-.63 1.89-1.78-.89A1 1 0 0 0 6 3.87L3.87 6a1 1 0 0 0-.19 1.15l.89 1.78-1.89.63a1 1 0 0 0-.68.94v3a1 1 0 0 0 .68.95l1.89.63-.89 1.78A1 1 0 0 0 3.87 18L6 20.13a1 1 0 0 0 1.15.19l1.78-.89.63 1.89a1 1 0 0 0 .95.68h3a1 1 0 0 0 .95-.68l.63-1.89 1.78.89a1 1 0 0 0 1.13-.19L20.13 18a1 1 0 0 0 .19-1.15l-.89-1.78 1.89-.63a1 1 0 0 0 .68-.94v-3a1 1 0 0 0-.68-.95ZM20 12.78l-1.2.4A2 2 0 0 0 17.64 16l.57 1.14-1.1 1.1-1.11-.6a2 2 0 0 0-2.79 1.16l-.4 1.2h-1.59l-.4-1.2A2 2 0 0 0 8 17.64l-1.14.57-1.1-1.1.6-1.11a2 2 0 0 0-1.16-2.82l-1.2-.4v-1.56l1.2-.4A2 2 0 0 0 6.36 8l-.57-1.11 1.1-1.1L8 6.36a2 2 0 0 0 2.82-1.16l.4-1.2h1.56l.4 1.2A2 2 0 0 0 16 6.36l1.14-.57 1.1 1.1-.6 1.11a2 2 0 0 0 1.16 2.79l1.2.4v1.59ZM12 8a4 4 0 1 0 0 8 4 4 0 0 0 0-8Zm0 6a2 2 0 1 1 0-4 2 2 0 0 1 0 4Z" /> </svg> wrangler.toml </a></li> </ul> </div> <div id="tab-panel-1233" aria-labelledby="tab-1233" role="tabpanel"> <div class="expressive-code"> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="jsonc"><code> <div class="ec-line"> <div class="code"> <span style="--0:#89DDFF;--1:#007474">{</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#89DDFF;--1:#007474">"</span><span style="--0:#C895EA;--1:#7C5B92">compatibility_flags</span><span style="--0:#89DDFF;--1:#007474">"</span><span style="--0:#89DDFF;--1:#007474">:</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">[</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#FDDA68;--1:#A84E00">"nodejs_compat"</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#89DDFF;--1:#007474">]</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#89DDFF;--1:#007474">}</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="{ "compatibility_flags": [ "nodejs_compat" ]}"> <div></div></button> </div> </figure> </div> </div> <div id="tab-panel-1234" aria-labelledby="tab-1234" role="tabpanel" hidden> <div class="expressive-code"> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="toml"><code> <div class="ec-line"> <div class="code"> <span style="--0:#EEFFFF;--1:#00268F">compatibility_flags</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">=</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">[</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#FDDA68;--1:#A84E00">"nodejs_compat"</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">]</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="compatibility_flags = [ "nodejs_compat" ]"> <div></div></button> </div> </figure> </div> </div> <starlight-tabs-restore class="astro-esqgolmp"></starlight-tabs-restore> </starlight-tabs> <p>As additional Node.js APIs are added, they will be made available under the <code dir="auto">nodejs_compat</code> compatibility flag. Unlike most other compatibility flags, we do not expect the <code dir="auto">nodejs_compat</code> to become active by default at a future date.</p> <p>The Node.js <code dir="auto">AsyncLocalStorage</code> API is a particularly useful feature for Workers. To enable only the <code dir="auto">AsyncLocalStorage</code> API, use the <code dir="auto">nodejs_als</code> compatibility flag.</p><starlight-tabs data-sync-key="wranglerConfig" class="astro-esqgolmp"> <div class="tablist-wrapper not-content astro-esqgolmp"> <ul role="tablist" class="astro-esqgolmp"> <li role="presentation" class="tab astro-esqgolmp"><a role="tab" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#tab-panel-1235" id="tab-1235" aria-selected="true" tabindex="0" class="astro-esqgolmp"> <svg aria-hidden="true" class="astro-esqgolmp astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1em;"> <path d="M0.734 13.269L0.562 10.732Q1.938 10.732 2.497 10.087L2.497 10.087Q2.884 9.614 2.884 8.711L2.884 8.711Q2.884 8.324 2.798 7.571Q2.712 6.819 2.712 6.410Q2.712 6.002 2.669 5.185L2.669 5.185Q2.583 4.454 2.583 4.153L2.583 4.153Q2.583 2.089 3.787 1.099Q4.991 0.111 7.184 0.111L7.184 0.111L8.259 0.111L8.259 2.648L7.700 2.648Q6.754 2.648 6.345 3.185Q5.937 3.723 5.937 4.798L5.937 4.798Q5.937 5.056 6.023 5.572L6.023 5.572Q6.109 6.217 6.109 6.561L6.109 6.561Q6.109 6.819 6.152 7.378L6.152 7.378Q6.238 8.152 6.238 8.582L6.238 8.582Q6.238 10.216 5.550 11.033L5.550 11.033Q4.948 11.764 3.658 12.065L3.658 12.065Q4.948 12.409 5.550 13.097L5.550 13.097Q6.238 13.957 6.238 15.548L6.238 15.548Q6.238 16.021 6.152 16.795L6.152 16.795Q6.066 17.354 6.088 17.612Q6.109 17.870 6.023 18.515L6.023 18.515Q5.937 18.988 5.937 19.203L5.937 19.203Q5.937 20.278 6.345 20.815Q6.754 21.353 7.700 21.353L7.700 21.353L8.259 21.353L8.259 23.890L7.184 23.890Q2.712 23.890 2.712 19.848L2.712 19.848Q2.712 18.386 2.862 17.590Q3.013 16.795 3.013 15.290L3.013 15.290Q3.013 13.269 0.734 13.269L0.734 13.269ZM23.438 10.732L23.438 13.011Q21.159 13.011 21.159 15.032L21.159 15.032Q21.159 15.419 21.224 16.171Q21.288 16.924 21.288 17.311L21.288 17.311Q21.417 18.128 21.417 19.590L21.417 19.590Q21.417 23.632 16.859 23.632L16.859 23.632L15.784 23.632L15.784 21.353L16.300 21.353Q17.246 21.353 17.654 20.815Q18.063 20.278 18.063 19.203Q18.063 18.128 17.934 17.569L17.934 17.569Q17.934 17.225 17.848 16.558Q17.762 15.892 17.762 15.548L17.762 15.548Q17.762 13.957 18.450 13.097L18.450 13.097Q19.052 12.409 20.342 12.065L20.342 12.065Q19.052 11.764 18.450 11.033L18.450 11.033Q17.762 10.216 17.762 8.582L17.762 8.582Q17.762 8.152 17.848 7.378L17.848 7.378Q17.934 6.819 17.934 6.561L17.934 6.561Q18.063 5.873 18.063 4.841Q18.063 3.809 17.633 3.293Q17.203 2.777 16.300 2.648L16.300 2.648L15.784 2.648L15.784 0.111L16.859 0.111Q19.009 0.111 20.213 1.099Q21.417 2.089 21.417 4.153L21.417 4.153Q21.417 4.540 21.352 5.292Q21.288 6.045 21.288 6.432L21.288 6.432Q21.159 7.249 21.116 8.711L21.116 8.711Q21.159 9.614 21.503 10.087L21.503 10.087Q22.062 10.732 23.438 10.732L23.438 10.732Z" /> </svg> wrangler.jsonc </a></li> <li role="presentation" class="tab astro-esqgolmp"><a role="tab" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#tab-panel-1236" id="tab-1236" aria-selected="false" tabindex="-1" class="astro-esqgolmp"> <svg aria-hidden="true" class="astro-esqgolmp astro-c6vsoqas" width="16" height="16" viewbox="0 0 24 24" fill="currentColor" style="--sl-icon-size: 1em;"> <path d="m21.32 9.55-1.89-.63.89-1.78A1 1 0 0 0 20.13 6L18 3.87a1 1 0 0 0-1.15-.19l-1.78.89-.63-1.89A1 1 0 0 0 13.5 2h-3a1 1 0 0 0-.95.68l-.63 1.89-1.78-.89A1 1 0 0 0 6 3.87L3.87 6a1 1 0 0 0-.19 1.15l.89 1.78-1.89.63a1 1 0 0 0-.68.94v3a1 1 0 0 0 .68.95l1.89.63-.89 1.78A1 1 0 0 0 3.87 18L6 20.13a1 1 0 0 0 1.15.19l1.78-.89.63 1.89a1 1 0 0 0 .95.68h3a1 1 0 0 0 .95-.68l.63-1.89 1.78.89a1 1 0 0 0 1.13-.19L20.13 18a1 1 0 0 0 .19-1.15l-.89-1.78 1.89-.63a1 1 0 0 0 .68-.94v-3a1 1 0 0 0-.68-.95ZM20 12.78l-1.2.4A2 2 0 0 0 17.64 16l.57 1.14-1.1 1.1-1.11-.6a2 2 0 0 0-2.79 1.16l-.4 1.2h-1.59l-.4-1.2A2 2 0 0 0 8 17.64l-1.14.57-1.1-1.1.6-1.11a2 2 0 0 0-1.16-2.82l-1.2-.4v-1.56l1.2-.4A2 2 0 0 0 6.36 8l-.57-1.11 1.1-1.1L8 6.36a2 2 0 0 0 2.82-1.16l.4-1.2h1.56l.4 1.2A2 2 0 0 0 16 6.36l1.14-.57 1.1 1.1-.6 1.11a2 2 0 0 0 1.16 2.79l1.2.4v1.59ZM12 8a4 4 0 1 0 0 8 4 4 0 0 0 0-8Zm0 6a2 2 0 1 1 0-4 2 2 0 0 1 0 4Z" /> </svg> wrangler.toml </a></li> </ul> </div> <div id="tab-panel-1235" aria-labelledby="tab-1235" role="tabpanel"> <div class="expressive-code"> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="jsonc"><code> <div class="ec-line"> <div class="code"> <span style="--0:#89DDFF;--1:#007474">{</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#89DDFF;--1:#007474">"</span><span style="--0:#C895EA;--1:#7C5B92">compatibility_flags</span><span style="--0:#89DDFF;--1:#007474">"</span><span style="--0:#89DDFF;--1:#007474">:</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">[</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#FDDA68;--1:#A84E00">"nodejs_als"</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#89DDFF;--1:#007474">]</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#89DDFF;--1:#007474">}</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="{ "compatibility_flags": [ "nodejs_als" ]}"> <div></div></button> </div> </figure> </div> </div> <div id="tab-panel-1236" aria-labelledby="tab-1236" role="tabpanel" hidden> <div class="expressive-code"> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="toml"><code> <div class="ec-line"> <div class="code"> <span style="--0:#EEFFFF;--1:#00268F">compatibility_flags</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">=</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">[</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#FDDA68;--1:#A84E00">"nodejs_als"</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">]</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="compatibility_flags = [ "nodejs_als" ]"> <div></div></button> </div> </figure> </div> </div> <starlight-tabs-restore class="astro-esqgolmp"></starlight-tabs-restore> </starlight-tabs> <div tabindex="-1" class="heading-wrapper level-h2"> <h2 id="flags-history">Flags history</h2><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#flags-history"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <p>Newest flags are listed first.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="enable-cache-no-store-http-standard-api">Enable <code>cache: no-store</code> HTTP standard API</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#enable-cache-no-store-http-standard-api"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2024-11-11</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>cache_option_enabled</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>cache_option_disabled</code></td> </tr> </tbody> </table> <p>When you enable the <code dir="auto">cache_option_enabled</code> compatibility flag, you can specify a value for the <code dir="auto">cache</code> property of the Request interface. When this compatibility flag is not enabled, or <code dir="auto">cache_option_disabled</code> is set, the Workers runtime will throw an <code dir="auto">Error</code> saying <code dir="auto">The 'cache' field on 'RequestInitializerDict' is not implemented.</code></p> <p>When this flag is enabled you can instruct Cloudflare not to cache the response from a subrequest you make from your Worker using the <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/fetch/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB"><code dir="auto">fetch()</code> API</a>:</p> <p>The only cache option enabled with <code dir="auto">cache_option_enabled</code> is <code dir="auto">'no-store'</code>. Specifying any other value will cause the Workers runtime to throw a <code dir="auto">TypeError</code> with the message <code dir="auto">Unsupported cache mode: <the-mode-you-specified></code>.</p> <p>When <code dir="auto">no-store</code> is specified:</p> <ul> <li><p>All requests have the headers <code dir="auto">Pragma: no-cache</code> and <code dir="auto">Cache-Control: no-cache</code> are set on them.</p></li> <li><p>Subrequests to origins not hosted by Cloudflare bypass Cloudflare's cache.</p></li> </ul> <p>Examples using <code dir="auto">cache: 'no-store'</code>:</p> <div class="expressive-code"> <link rel="stylesheet" href="/_astro/ec.rt9t7.css"> <script type="module" src="/_astro/ec.8zarh.js"></script> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="js"><code> <div class="ec-line"> <div class="code"> <span style="--0:#EE9080;--1:#8F1500">const</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EEFFFF;--1:#00268F">response</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">=</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">await</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#57C78F;--1:#00783C">fetch</span><span style="--0:#EE9080;--1:#32008F">(</span><span style="--0:#FDDA68;--1:#A84E00">"https://example.com"</span><span style="--0:#89DDFF;--1:#007474">,</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#89DDFF;--1:#007474">{</span><span style="--0:#EE9080;--1:#32008F"> cache</span><span style="--0:#89DDFF;--1:#007474">:</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#FDDA68;--1:#A84E00">"no-store"</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#89DDFF;--1:#007474">}</span><span style="--0:#EE9080;--1:#32008F">)</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="const response = await fetch("https://example.com", { cache: "no-store" });"> <div></div></button> </div> </figure> </div> <p>The cache value can also be set on a <code dir="auto">Request</code> object.</p> <div class="expressive-code"> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="js"><code> <div class="ec-line"> <div class="code"> <span style="--0:#EE9080;--1:#8F1500">const</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EEFFFF;--1:#00268F">request</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">=</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">new</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#57C78F;--1:#00783C">Request</span><span style="--0:#EE9080;--1:#32008F">(</span><span style="--0:#FDDA68;--1:#A84E00">"https://example.com"</span><span style="--0:#89DDFF;--1:#007474">,</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#89DDFF;--1:#007474">{</span><span style="--0:#EE9080;--1:#32008F"> cache</span><span style="--0:#89DDFF;--1:#007474">:</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#FDDA68;--1:#A84E00">"no-store"</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#89DDFF;--1:#007474">}</span><span style="--0:#EE9080;--1:#32008F">)</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#EE9080;--1:#8F1500">const</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EEFFFF;--1:#00268F">response</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">=</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">await</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#57C78F;--1:#00783C">fetch</span><span style="--0:#EE9080;--1:#32008F">(</span><span style="--0:#D5D7D8;--1:#8F1500">request</span><span style="--0:#EE9080;--1:#32008F">)</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="const request = new Request("https://example.com", { cache: "no-store" });const response = await fetch(request);"> <div></div></button> </div> </figure> </div> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="allow-specifying-a-custom-port-when-making-a-subrequest-with-the-fetch-api">Allow specifying a custom port when making a subrequest with the fetch() API</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#allow-specifying-a-custom-port-when-making-a-subrequest-with-the-fetch-api"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2024-09-02</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>allow_custom_ports</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>ignore_custom_ports</code></td> </tr> </tbody> </table> <p>When this flag is enabled, and you specify a port when making a subrequest with the <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/fetch/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB"><code dir="auto">fetch()</code> API</a>, the port number you specify will be used.</p> <p>When you make a subrequest to a website that uses Cloudflare ("Orange Clouded") — only <a href="https://developers-cloudflare-com.translate.goog/fundamentals/reference/network-ports/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#network-ports-compatible-with-cloudflares-proxy">ports supported by Cloudflare's reverse proxy</a> can be specified. If you attempt to specify an unsupported port, it will be ignored.</p> <p>When you make a subrequest to a website that doesn't use Cloudflare ("Grey Clouded") - any port can be specified.</p> <p>For example:</p> <div class="expressive-code"> <link rel="stylesheet" href="/_astro/ec.rt9t7.css"> <script type="module" src="/_astro/ec.8zarh.js"></script> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="js"><code> <div class="ec-line"> <div class="code"> <span style="--0:#EE9080;--1:#8F1500">const</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EEFFFF;--1:#00268F">response</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">=</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">await</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#57C78F;--1:#00783C">fetch</span><span style="--0:#EE9080;--1:#32008F">(</span><span style="--0:#FDDA68;--1:#A84E00">"https://example.com:8000"</span><span style="--0:#EE9080;--1:#32008F">)</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="const response = await fetch("https://example.com:8000");"> <div></div></button> </div> </figure> </div> <p>With allow_custom_ports the above example would fetch <code dir="auto">https://example.com:8000</code> rather than <code dir="auto">https://example.com:443</code>.</p> <p>Note that creating a WebSocket client with a call to <code dir="auto">new WebSocket(url)</code> will also obey this flag.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="properly-extract-blob-mime-type-from-content-type-headers">Properly extract blob MIME type from <code>content-type</code> headers</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#properly-extract-blob-mime-type-from-content-type-headers"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2024-06-03</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>blob_standard_mime_type</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>blob_legacy_mime_type</code></td> </tr> </tbody> </table> <p>When calling <code dir="auto">response.blob.type()</code>, the MIME type will now be properly extracted from <code dir="auto">content-type</code> headers, per the <a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://fetch.spec.whatwg.org/%23concept-header-extract-mime-type" target="_blank" rel="noopener">WHATWG spec<span class="external-link"> ↗</span></a>.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="use-standard-url-parsing-in-fetch">Use standard URL parsing in <code>fetch()</code></h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#use-standard-url-parsing-in-fetch"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2024-06-03</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>fetch_standard_url</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>fetch_legacy_url</code></td> </tr> </tbody> </table> <p>The <code dir="auto">fetch_standard_url</code> flag makes <code dir="auto">fetch()</code> use <a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://url.spec.whatwg.org/" target="_blank" rel="noopener">WHATWG URL Standard<span class="external-link"> ↗</span></a> parsing rules. The original implementation would throw <code dir="auto">TypeError: Fetch API cannot load</code> errors with some URLs where standard parsing does not, for instance with the inclusion of whitespace before the URL. URL errors will now be thrown immediately upon calling <code dir="auto">new Request()</code> with an improper URL. Previously, URL errors were thrown only once <code dir="auto">fetch()</code> was called.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="returning-empty-uint8array-on-final-byob-read">Returning empty Uint8Array on final BYOB read</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#returning-empty-uint8array-on-final-byob-read"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2024-05-13</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>internal_stream_byob_return_view</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>internal_stream_byob_return_undefined</code></td> </tr> </tbody> </table> <p>In the original implementation of BYOB ("Bring your own buffer") <code dir="auto">ReadableStreams</code>, the <code dir="auto">read()</code> method would return <code dir="auto">undefined</code> when the stream was closed and there was no more data to read. This behavior was inconsistent with the standard <code dir="auto">ReadableStream</code> behavior, which returns an empty <code dir="auto">Uint8Array</code> when the stream is closed.</p> <p>When the <code dir="auto">internal_stream_byob_return_view</code> flag is used, the BYOB <code dir="auto">read()</code> will implement standard behavior.</p> <div class="expressive-code"> <link rel="stylesheet" href="/_astro/ec.rt9t7.css"> <script type="module" src="/_astro/ec.8zarh.js"></script> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="js"><code> <div class="ec-line"> <div class="code"> <span style="--0:#EE9080;--1:#8F1500">const</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EEFFFF;--1:#00268F">resp</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">=</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">await</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#57C78F;--1:#00783C">fetch</span><span style="--0:#EE9080;--1:#32008F">(</span><span style="--0:#FDDA68;--1:#A84E00">'https://example.org'</span><span style="--0:#EE9080;--1:#32008F">)</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#EE9080;--1:#8F1500">const</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EEFFFF;--1:#00268F">reader</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">=</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EEFFFF;--1:#00268F">resp</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#EEFFFF;--1:#00268F">body</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#57C78F;--1:#00783C">getReader</span><span style="--0:#EE9080;--1:#32008F">(</span><span style="--0:#89DDFF;--1:#007474">{</span><span style="--0:#EE9080;--1:#32008F"> mode</span><span style="--0:#89DDFF;--1:#007474">:</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#FDDA68;--1:#A84E00">'byob'</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#89DDFF;--1:#007474">}</span><span style="--0:#EE9080;--1:#32008F">)</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#EE9080;--1:#8F1500">await</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#D5D7D8;--1:#8F1500">result</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#EE9080;--1:#8F1500">=</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#EE9080;--1:#8F1500">await</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#EEFFFF;--1:#00268F">reader</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#57C78F;--1:#00783C">read</span><span style="--0:#EEFFFF;--1:#62676A">(</span><span style="--0:#EE9080;--1:#8F1500">new</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#57C78F;--1:#00783C">Uint8Array</span><span style="--0:#EEFFFF;--1:#62676A">(</span><span style="--0:#B59EE1;--1:#7C008F">10</span><span style="--0:#EEFFFF;--1:#62676A">))</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div> <div class="ec-line"> <div class="code"> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#EE9080;--1:#8F1500">if</span><span style="--0:#EEFFFF;--1:#62676A"> (</span><span style="--0:#EEFFFF;--1:#00268F">result</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#EEFFFF;--1:#00268F">done</span><span style="--0:#EEFFFF;--1:#62676A">) </span><span style="--0:#89DDFF;--1:#007474">{</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#A9A9A5;--0fs:italic;--1:#62676A;--1fs:italic">// The result gives us an empty Uint8Array...</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"><span style="--0:#EEFFFF"> </span></span><span style="--0:#EEFFFF;--1:#00268F">console</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#57C78F;--1:#00783C">log</span><span style="--0:#EEFFFF;--1:#62676A">(</span><span style="--0:#EEFFFF;--1:#00268F">result</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#EEFFFF;--1:#00268F">value</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#EEFFFF;--1:#00268F">byteLength</span><span style="--0:#EEFFFF;--1:#62676A">)</span><span style="--0:#89DDFF;--1:#007474">;</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#A9A9A5;--0fs:italic;--1:#62676A;--1fs:italic">// 0</span> </div> </div> <div class="ec-line"> <div class="code"> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#A9A9A5;--0fs:italic;--1:#62676A;--1fs:italic">// However, it is backed by the same underlying memory that was passed</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#A9A9A5;--0fs:italic;--1:#62676A;--1fs:italic">// into the read call.</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"><span style="--0:#EEFFFF"> </span></span><span style="--0:#EEFFFF;--1:#00268F">console</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#57C78F;--1:#00783C">log</span><span style="--0:#EEFFFF;--1:#62676A">(</span><span style="--0:#EEFFFF;--1:#00268F">result</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#EEFFFF;--1:#00268F">value</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#EEFFFF;--1:#00268F">buffer</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#EEFFFF;--1:#00268F">byteLength</span><span style="--0:#EEFFFF;--1:#62676A">)</span><span style="--0:#89DDFF;--1:#007474">;</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#A9A9A5;--0fs:italic;--1:#62676A;--1fs:italic">// 10</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#89DDFF;--1:#007474">}</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="const resp = await fetch('https://example.org');const reader = resp.body.getReader({ mode: 'byob' });await result = await reader.read(new Uint8Array(10));if (result.done) { // The result gives us an empty Uint8Array... console.log(result.value.byteLength); // 0 // However, it is backed by the same underlying memory that was passed // into the read call. console.log(result.value.buffer.byteLength); // 10}"> <div></div></button> </div> </figure> </div> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="brotli-content-encoding-support">Brotli Content-Encoding support</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#brotli-content-encoding-support"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2024-04-29</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>brotli_content_encoding</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>no_brotli_content_encoding</code></td> </tr> </tbody> </table> <p>When the <code dir="auto">brotli_content_encoding</code> compatibility flag is enabled, Workers supports the <code dir="auto">br</code> content encoding and can request and respond with data encoded using the <a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://developer.mozilla.org/en-US/docs/Glossary/Brotli_compression" target="_blank" rel="noopener">Brotli<span class="external-link"> ↗</span></a> compression algorithm. This reduces the amount of data that needs to be fetched and can be used to pass through the original compressed data to the client. See the Fetch API <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/fetch/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#how-the-accept-encoding-header-is-handled">documentation</a> for details.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="durable-object-stubs-and-service-bindings-support-rpc">Durable Object stubs and Service Bindings support RPC</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#durable-object-stubs-and-service-bindings-support-rpc"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2024-04-03</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>rpc</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>no_rpc</code></td> </tr> </tbody> </table> <p>With this flag on, <a href="https://developers-cloudflare-com.translate.goog/durable-objects/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Durable Object</a> stubs and <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/bindings/service-bindings/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Service Bindings</a> support <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/rpc/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">RPC</a>. This means that these objects now appear as if they define every possible method name. Calling any method name sends an RPC to the remote Durable Object or Worker service.</p> <p>For most applications, this change will have no impact unless you use it. However, it's possible some existing code will be impacted if it explicitly checks for the existence of method names that were previously not defined on these types. For example, we've seen code in the wild which iterates over <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/bindings/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">bindings</a> and tries to auto-detect their types based on what methods they implement. Such code will now see service bindings as implementing every method, so may misinterpret service bindings as being some other type. In the cases we've seen, the impact was benign (nothing actually broke), but out of caution we are guarding this change behind a flag.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="handling-custom-thenables">Handling custom thenables</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#handling-custom-thenables"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2024-04-01</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>unwrap_custom_thenables</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>no_unwrap_custom_thenables</code></td> </tr> </tbody> </table> <p>With the <code dir="auto">unwrap_custom_thenables</code> flag set, various Workers APIs that accept promises will also correctly handle custom thenables (objects with a <code dir="auto">then</code> method) that are not native promises, but are intended to be treated as such). For example, the <code dir="auto">waitUntil</code> method of the <code dir="auto">ExecutionContext</code> object will correctly handle custom thenables, allowing them to be used in place of native promises.</p> <div class="expressive-code"> <link rel="stylesheet" href="/_astro/ec.rt9t7.css"> <script type="module" src="/_astro/ec.8zarh.js"></script> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="js"><code> <div class="ec-line"> <div class="code"> <span style="--0:#D5D7D8;--1:#8F1500">async</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#57C78F;--1:#00783C">fetch</span><span style="--0:#EEFFFF;--1:#62676A">(</span><span style="--0:#D5D7D8;--1:#8F1500">req</span><span style="--0:#89DDFF;--1:#007474">,</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#D5D7D8;--1:#8F1500">env</span><span style="--0:#89DDFF;--1:#007474">,</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#D5D7D8;--1:#8F1500">ctx</span><span style="--0:#EEFFFF;--1:#62676A">) </span><span style="--0:#89DDFF;--1:#007474">{</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"><span style="--0:#EEFFFF"> </span></span><span style="--0:#EEFFFF;--1:#00268F">ctx</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#57C78F;--1:#00783C">waitUntil</span><span style="--0:#EEFFFF;--1:#62676A">(</span><span style="--0:#89DDFF;--1:#007474">{</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#57C78F;--1:#00783C">then</span><span style="--0:#89DDFF;--1:#007474">(</span><span style="--0:#B59EE1;--1:#7C008F">res</span><span style="--0:#89DDFF;--1:#007474">)</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">{</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#A9A9A5;--0fs:italic;--1:#62676A;--1fs:italic">// Resolve the thenable after 1 second</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#57C78F;--1:#00783C">setTimeout</span><span style="--0:#EEFFFF;--1:#62676A">(</span><span style="--0:#D5D7D8;--1:#8F1500">res</span><span style="--0:#89DDFF;--1:#007474">,</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#B59EE1;--1:#7C008F">1000</span><span style="--0:#EEFFFF;--1:#62676A">)</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#89DDFF;--1:#007474">}</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#89DDFF;--1:#007474">}</span><span style="--0:#EEFFFF;--1:#62676A">)</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#A9A9A5;--0fs:italic;--1:#62676A;--1fs:italic">// ...</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#89DDFF;--1:#007474">}</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="async fetch(req, env, ctx) { ctx.waitUntil({ then(res) { // Resolve the thenable after 1 second setTimeout(res, 1000); } }); // ...}"> <div></div></button> </div> </figure> </div> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="fetchers-no-longer-have-getputdelete-helper-methods">Fetchers no longer have get/put/delete helper methods</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#fetchers-no-longer-have-getputdelete-helper-methods"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2024-03-26</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>fetcher_no_get_put_delete</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>fetcher_has_get_put_delete</code></td> </tr> </tbody> </table> <p><a href="https://developers-cloudflare-com.translate.goog/durable-objects/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Durable Object</a> stubs and <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/bindings/service-bindings/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Service Bindings</a> both implement a <code dir="auto">fetch()</code> method which behaves similarly to the global <code dir="auto">fetch()</code> method, but requests are instead sent to the destination represented by the object, rather than being routed based on the URL.</p> <p>Historically, API objects that had such a <code dir="auto">fetch()</code> method also had methods <code dir="auto">get()</code>, <code dir="auto">put()</code>, and <code dir="auto">delete()</code>. These methods were thin wrappers around <code dir="auto">fetch()</code> which would perform the corresponding HTTP method and automatically handle writing/reading the request/response bodies as needed.</p> <p>These methods were a very early idea from many years ago, but were never actually documented, and therefore rarely (if ever) used. Enabling the <code dir="auto">fetcher_no_get_put_delete</code>, or setting a compatibility date on or after <code dir="auto">2024-03-26</code> disables these methods for your Worker.</p> <p>This change paves a future path for you to be able to define your own custom methods using these names. Without this change, you would be unable to define your own <code dir="auto">get</code>, <code dir="auto">put</code>, and <code dir="auto">delete</code> methods, since they would conflict with these built-in helper methods.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="queues-send-messages-in-json-format">Queues send messages in <code>JSON</code> format</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#queues-send-messages-in-json-format"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2024-03-18</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>queues_json_messages</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>no_queues_json_messages</code></td> </tr> </tbody> </table> <p>With the <code dir="auto">queues_json_messages</code> flag set, Queue bindings will serialize values passed to <code dir="auto">send()</code> or <code dir="auto">sendBatch()</code> into JSON format by default (when no specific <code dir="auto">contentType</code> is provided).</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="suppress-global-importscripts">Suppress global <code>importScripts()</code></h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#suppress-global-importscripts"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2024-03-04</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>no_global_importscripts</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>global_importscripts</code></td> </tr> </tbody> </table> <p>Suppresses the global <code dir="auto">importScripts()</code> function. This method was included in the Workers global scope but was marked explicitly as non-implemented. However, the presence of the function could cause issues with some libraries. This compatibility flag removes the function from the global scope.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="nodejs-asynclocalstorage">Node.js AsyncLocalStorage</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#nodejs-asynclocalstorage"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Flag to enable</strong></td> <td><code>nodejs_als</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>no_nodejs_als</code></td> </tr> </tbody> </table> <p>Enables the availability of the Node.js <a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://nodejs.org/api/async_hooks.html%23async_hooks_class_asynclocalstorage" target="_blank" rel="noopener">AsyncLocalStorage<span class="external-link"> ↗</span></a> API in Workers. This API allows you to store data that is accessible to all asynchronous operations within a given execution context. This is useful for storing data that is relevant to the current request, such as request-specific metadata or tracing information.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="python-workers">Python Workers</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#python-workers"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2024-01-29</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>python_workers</code></td> </tr> </tbody> </table> <p>This flag enables first class support for Python. <a href="https://developers-cloudflare-com.translate.goog/workers/languages/python/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Python Workers</a> implement the majority of Python's <a href="https://developers-cloudflare-com.translate.goog/workers/languages/python/stdlib?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">standard library</a>, support all <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/bindings?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">bindings</a>, <a href="https://developers-cloudflare-com.translate.goog/workers/configuration/environment-variables?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">environment variable</a>, and <a href="https://developers-cloudflare-com.translate.goog/workers/configuration/secrets?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">secrets</a>, and integration with JavaScript objects and functions via a <a href="https://developers-cloudflare-com.translate.goog/workers/languages/python/ffi?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">foreign function interface</a>.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="webcrypto-preserve-publicexponent-field">WebCrypto preserve publicExponent field</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#webcrypto-preserve-publicexponent-field"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2023-12-01</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>crypto_preserve_public_exponent</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>no_crypto_preserve_public_exponent</code></td> </tr> </tbody> </table> <p>In the WebCrypto API, the <code dir="auto">publicExponent</code> field of the algorithm of RSA keys would previously be an <code dir="auto">ArrayBuffer</code>. Using this flag, <code dir="auto">publicExponent</code> is a <code dir="auto">Uint8Array</code> as mandated by the specification.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="vectorize-query-with-metadata-optionally-returned"><code>Vectorize</code> query with metadata optionally returned</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#vectorize-query-with-metadata-optionally-returned"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2023-11-08</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>vectorize_query_metadata_optional</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>vectorize_query_original</code></td> </tr> </tbody> </table> <p>A set value on <code dir="auto">vectorize_query_metadata_optional</code> indicates that the Vectorize query operation should accept newer arguments with <code dir="auto">returnValues</code> and <code dir="auto">returnMetadata</code> specified discretely over the older argument <code dir="auto">returnVectors</code>. This also changes the return format. If the vector values have been indicated for return, the return value is now a flattened vector object with <code dir="auto">score</code> attached where it previously contained a nested vector object.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="websocket-compression">WebSocket Compression</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#websocket-compression"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2023-08-15</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>web_socket_compression</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>no_web_socket_compression</code></td> </tr> </tbody> </table> <p>The Workers runtime did not support WebSocket compression when the initial WebSocket implementation was released. Historically, the runtime has stripped or ignored the <code dir="auto">Sec-WebSocket-Extensions</code> header -- but is now capable of fully complying with the WebSocket Compression RFC. Since many clients are likely sending <code dir="auto">Sec-WebSocket-Extensions: permessage-deflate</code> to their Workers today (<code dir="auto">new WebSocket(url)</code> automatically sets this in browsers), we have decided to maintain prior behavior if this flag is absent.</p> <p>If the flag is present, the Workers runtime is capable of using WebSocket Compression on both inbound and outbound WebSocket connections.</p> <p>Like browsers, calling <code dir="auto">new WebSocket(url)</code> in a Worker will automatically set the <code dir="auto">Sec-WebSocket-Extensions: permessage-deflate</code> header. If you are using the non-standard <code dir="auto">fetch()</code> API to obtain a WebSocket, you can include the <code dir="auto">Sec-WebSocket-Extensions</code> header with value <code dir="auto">permessage-deflate</code> and include any of the compression parameters defined in <a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://datatracker.ietf.org/doc/html/rfc7692%23section-7" target="_blank" rel="noopener">RFC-7692<span class="external-link"> ↗</span></a>.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="strict-crypto-error-checking">Strict crypto error checking</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#strict-crypto-error-checking"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2023-08-01</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>strict_crypto_checks</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>no_strict_crypto_checks</code></td> </tr> </tbody> </table> <p>Perform additional error checking in the Web Crypto API to conform with the specification and reject possibly unsafe key parameters:</p> <ul> <li>For RSA key generation, key sizes are required to be multiples of 128 bits as boringssl may otherwise truncate the key.</li> <li>The size of imported RSA keys must be at least 256 bits and at most 16384 bits, as with newly generated keys.</li> <li>The public exponent for imported RSA keys is restricted to the commonly used values <code dir="auto">[3, 17, 37, 65537]</code>.</li> <li>In conformance with the specification, an error will be thrown when trying to import a public ECDH key with non-empty usages.</li> </ul> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="strict-compression-error-checking">Strict compression error checking</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#strict-compression-error-checking"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2023-08-01</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>strict_compression_checks</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>no_strict_compression_checks</code></td> </tr> </tbody> </table> <p>Perform additional error checking in the Compression Streams API and throw an error if a <code dir="auto">DecompressionStream</code> has trailing data or gets closed before the full compressed data has been provided.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="bot-management-data">Bot Management data</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#bot-management-data"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2023-08-01</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>no_cf_botmanagement_default</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>cf_botmanagement_default</code></td> </tr> </tbody> </table> <p>This flag streamlines Workers requests by reducing unnecessary properties in the <code dir="auto">request.cf</code> object.</p> <p>With the flag enabled - either by default after 2023-08-01 or by setting the <code dir="auto">no_cf_botmanagement_default</code> flag - Cloudflare will only include the <a href="https://developers-cloudflare-com.translate.goog/bots/reference/bot-management-variables/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Bot Management object</a> in a Worker's <code dir="auto">request.cf</code> if the account has access to Bot Management.</p> <p>With the flag disabled, Cloudflare will include a default Bot Management object, regardless of whether the account is entitled to Bot Management.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="urlsearchparams-delete-and-has-value-argument">URLSearchParams delete() and has() value argument</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#urlsearchparams-delete-and-has-value-argument"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2023-07-01</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>urlsearchparams_delete_has_value_arg</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>no_urlsearchparams_delete_has_value_arg</code></td> </tr> </tbody> </table> <p>The WHATWG introduced additional optional arguments to the <code dir="auto">URLSearchParams</code> object <a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams/delete" target="_blank" rel="noopener"><code dir="auto">delete()</code><span class="external-link"> ↗</span></a> and <a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams/has" target="_blank" rel="noopener"><code dir="auto">has()</code><span class="external-link"> ↗</span></a> methods that allow for more precise control over the removal of query parameters. Because the arguments are optional and change the behavior of the methods when present there is a risk of breaking existing code. If your compatibility date is set to July 1, 2023 or after, this compatibility flag will be enabled by default.</p> <p>For an example of how this change could break existing code, consider code that uses the <code dir="auto">Array</code> <code dir="auto">forEach()</code> method to iterate through a number of parameters to delete:</p> <div class="expressive-code"> <link rel="stylesheet" href="/_astro/ec.rt9t7.css"> <script type="module" src="/_astro/ec.8zarh.js"></script> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="js"><code> <div class="ec-line"> <div class="code"> <span style="--0:#EE9080;--1:#8F1500">const</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EEFFFF;--1:#00268F">usp</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">=</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">new</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#57C78F;--1:#00783C">URLSearchParams</span><span style="--0:#EE9080;--1:#32008F">()</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#A9A9A5;--0fs:italic;--1:#62676A;--1fs:italic">// ...</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#EEFFFF;--1:#62676A">[</span><span style="--0:#FDDA68;--1:#A84E00">'abc'</span><span style="--0:#89DDFF;--1:#007474">,</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#FDDA68;--1:#A84E00">'xyz'</span><span style="--0:#EEFFFF;--1:#62676A">]</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#57C78F;--1:#00783C">forEach</span><span style="--0:#EEFFFF;--1:#62676A">(</span><span style="--0:#EEFFFF;--1:#00268F">usp</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#EEFFFF;--1:#00268F">delete</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#57C78F;--1:#00783C">bind</span><span style="--0:#EEFFFF;--1:#62676A">(</span><span style="--0:#D5D7D8;--1:#8F1500">usp</span><span style="--0:#EEFFFF;--1:#62676A">))</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="const usp = new URLSearchParams();// ...['abc', 'xyz'].forEach(usp.delete.bind(usp));"> <div></div></button> </div> </figure> </div> <p>The <code dir="auto">forEach()</code> automatically passes multiple parameters to the function that is passed in. Prior to the addition of the new standard parameters, these extra arguments would have been ignored.</p> <p>Now, however, the additional arguments have meaning and change the behavior of the function. With this flag, the example above would need to be changed to:</p> <div class="expressive-code"> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="js"><code> <div class="ec-line"> <div class="code"> <span style="--0:#EE9080;--1:#8F1500">const</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EEFFFF;--1:#00268F">usp</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">=</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">new</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#57C78F;--1:#00783C">URLSearchParams</span><span style="--0:#EE9080;--1:#32008F">()</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#A9A9A5;--0fs:italic;--1:#62676A;--1fs:italic">// ...</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#EEFFFF;--1:#62676A">[</span><span style="--0:#FDDA68;--1:#A84E00">'abc'</span><span style="--0:#89DDFF;--1:#007474">,</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#FDDA68;--1:#A84E00">'xyz'</span><span style="--0:#EEFFFF;--1:#62676A">]</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#57C78F;--1:#00783C">forEach</span><span style="--0:#EEFFFF;--1:#62676A">(</span><span style="--0:#89DDFF;--1:#007474">(</span><span style="--0:#B59EE1;--1:#7C008F">key</span><span style="--0:#89DDFF;--1:#007474">)</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#EE9080;--1:#8F1500">=></span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#EEFFFF;--1:#00268F">usp</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#57C78F;--1:#00783C">delete</span><span style="--0:#EEFFFF;--1:#62676A">(</span><span style="--0:#D5D7D8;--1:#8F1500">key</span><span style="--0:#EEFFFF;--1:#62676A">))</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="const usp = new URLSearchParams();// ...['abc', 'xyz'].forEach((key) => usp.delete(key));"> <div></div></button> </div> </figure> </div> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="use-a-spec-compliant-url-implementation-in-redirects">Use a spec compliant URL implementation in redirects</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#use-a-spec-compliant-url-implementation-in-redirects"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2023-03-14</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>response_redirect_url_standard</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>response_redirect_url_original</code></td> </tr> </tbody> </table> <p>Change the URL implementation used in <code dir="auto">Response.redirect()</code> to be spec-compliant (WHATWG URL Standard).</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="dynamic-dispatch-exception-propagation">Dynamic Dispatch Exception Propagation</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#dynamic-dispatch-exception-propagation"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2023-03-01</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>dynamic_dispatch_tunnel_exceptions</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>dynamic_dispatch_treat_exceptions_as_500</code></td> </tr> </tbody> </table> <p>Previously, when using Workers for Platforms' <a href="https://developers-cloudflare-com.translate.goog/cloudflare-for-platforms/workers-for-platforms/get-started/dynamic-dispatch/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">dynamic dispatch API</a> to send an HTTP request to a user Worker, if the user Worker threw an exception, the dynamic dispatch Worker would receive an HTTP <code dir="auto">500</code> error with no body. When the <code dir="auto">dynamic_dispatch_tunnel_exceptions</code> compatibility flag is enabled, the exception will instead propagate back to the dynamic dispatch Worker. The <code dir="auto">fetch()</code> call in the dynamic dispatch Worker will throw the same exception. This matches the similar behavior of <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/bindings/service-bindings/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">service bindings</a> and <a href="https://developers-cloudflare-com.translate.goog/durable-objects/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Durable Objects</a>.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="headers-supports-getsetcookie"><code>Headers</code> supports <code>getSetCookie()</code></h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#headers-supports-getsetcookie"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2023-03-01</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>http_headers_getsetcookie</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>no_http_headers_getsetcookie</code></td> </tr> </tbody> </table> <p>Adds the <a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://developer.mozilla.org/en-US/docs/Web/API/Headers/getSetCookie" target="_blank" rel="noopener"><code dir="auto">getSetCookie()</code><span class="external-link"> ↗</span></a> method to the <a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://developer.mozilla.org/en-US/docs/Web/API/Headers" target="_blank" rel="noopener">Headers<span class="external-link"> ↗</span></a> API in Workers.</p> <div class="expressive-code"> <link rel="stylesheet" href="/_astro/ec.rt9t7.css"> <script type="module" src="/_astro/ec.8zarh.js"></script> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="js"><code> <div class="ec-line"> <div class="code"> <span style="--0:#EE9080;--1:#8F1500">const</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EEFFFF;--1:#00268F">response</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">=</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">await</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#57C78F;--1:#00783C">fetch</span><span style="--0:#EE9080;--1:#32008F">(</span><span style="--0:#FDDA68;--1:#A84E00">"https://example.com"</span><span style="--0:#EE9080;--1:#32008F">)</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#EE9080;--1:#8F1500">let</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#D5D7D8;--1:#8F1500">cookieValues</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">=</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EEFFFF;--1:#00268F">response</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#EEFFFF;--1:#00268F">headers</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#57C78F;--1:#00783C">getSetCookie</span><span style="--0:#EE9080;--1:#32008F">()</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="const response = await fetch("https://example.com");let cookieValues = response.headers.getSetCookie();"> <div></div></button> </div> </figure> </div> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="nodejs-compatibility">Node.js compatibility</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#nodejs-compatibility"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Flag to enable</strong></td> <td><code>nodejs_compat</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>no_nodejs_compat</code></td> </tr> </tbody> </table> <p>Enables the full set of <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/nodejs/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">available Node.js APIs</a> in the Workers Runtime.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="streams-constructors">Streams Constructors</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#streams-constructors"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2022-11-30</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>streams_enable_constructors</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>streams_disable_constructors</code></td> </tr> </tbody> </table> <p>Adds the work-in-progress <code dir="auto">new ReadableStream()</code> and <code dir="auto">new WritableStream()</code> constructors backed by JavaScript underlying sources and sinks.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="compliant-transformstream-constructor">Compliant TransformStream constructor</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#compliant-transformstream-constructor"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2022-11-30</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>transformstream_enable_standard_constructor</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>transformstream_disable_standard_constructor</code></td> </tr> </tbody> </table> <p>Previously, the <code dir="auto">new TransformStream()</code> constructor was not compliant with the Streams API standard. Use the <code dir="auto">transformstream_enable_standard_constructor</code> to opt-in to the backwards-incompatible change to make the constructor compliant. Must be used in combination with the <code dir="auto">streams_enable_constructors</code> flag.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="commonjs-modules-do-not-export-a-module-namespace">CommonJS modules do not export a module namespace</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#commonjs-modules-do-not-export-a-module-namespace"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2022-10-31</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>export_commonjs_default</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>export_commonjs_namespace</code></td> </tr> </tbody> </table> <p>CommonJS modules were previously exporting a module namespace (an object like <code dir="auto">{ default: module.exports }</code>) rather than exporting only the <code dir="auto">module.exports</code>. When this flag is enabled, the export is fixed.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="do-not-throw-from-async-functions">Do not throw from async functions</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#do-not-throw-from-async-functions"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2022-10-31</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>capture_async_api_throws</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>do_not_capture_async_api_throws</code></td> </tr> </tbody> </table> <p>The <code dir="auto">capture_async_api_throws</code> compatibility flag will ensure that, in conformity with the standards API, async functions will only ever reject if they throw an error. The inverse <code dir="auto">do_not_capture_async_api_throws</code> flag means that async functions which contain an error may throw that error synchronously rather than rejecting.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="new-url-parser-implementation">New URL parser implementation</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#new-url-parser-implementation"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2022-10-31</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>url_standard</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>url_original</code></td> </tr> </tbody> </table> <p>The original implementation of the <a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://developer.mozilla.org/en-US/docs/Web/API/URL" target="_blank" rel="noopener"><code dir="auto">URL</code><span class="external-link"> ↗</span></a> API in Workers was not fully compliant with the <a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://url.spec.whatwg.org/" target="_blank" rel="noopener">WHATWG URL Standard<span class="external-link"> ↗</span></a>, differing in several ways, including:</p> <ul> <li><p>The original implementation collapsed sequences of multiple slashes into a single slash:</p><p><code dir="auto">new URL("https://example.com/a//b").toString() === "https://example.com/a/b"</code></p></li> <li><p>The original implementation would throw <code dir="auto">"TypeError: Invalid URL string."</code> if it encountered invalid percent-encoded escape sequences, like <code dir="auto">https://example.com/a%%b</code>.</p></li> <li><p>The original implementation would percent-encode or percent-decode certain content differently:</p><p><code dir="auto">new URL("https://example.com/a%40b?c d%20e?f").toString() === "https://example.com/a@b?c+d+e%3Ff"</code></p></li> <li><p>The original implementation lacked more recently implemented <code dir="auto">URL</code> features, like <a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://developer.mozilla.org/en-US/docs/Web/API/URL/canParse_static" target="_blank" rel="noopener"><code dir="auto">URL.canParse()</code><span class="external-link"> ↗</span></a>.</p></li> </ul> <p>Set the compatibility date of your Worker to a date after <code dir="auto">2022-10-31</code> or enable the <code dir="auto">url_standard</code> compatibility flag to opt-in the fully spec compliant <code dir="auto">URL</code> API implementation.</p> <p>Refer to the <a href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#use-a-spec-compliant-url-implementation-in-redirects"><code dir="auto">response_redirect_url_standard</code> compatibility flag</a> , which affects the URL implementation used in <code dir="auto">Response.redirect()</code>.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="r2-bucket-list-respects-the-include-option"><code>R2</code> bucket <code>list</code> respects the <code>include</code> option</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#r2-bucket-list-respects-the-include-option"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2022-08-04</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>r2_list_honor_include</code></td> </tr> </tbody> </table> <p>With the <code dir="auto">r2_list_honor_include</code> flag set, the <code dir="auto">include</code> argument to R2 <code dir="auto">list</code> options is honored. With an older compatibility date and without this flag, the <code dir="auto">include</code> argument behaves implicitly as <code dir="auto">include: ["httpMetadata", "customMetadata"]</code>.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="do-not-substitute-null-on-typeerror">Do not substitute <code>null</code> on <code>TypeError</code></h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#do-not-substitute-null-on-typeerror"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2022-06-01</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>dont_substitute_null_on_type_error</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>substitute_null_on_type_error</code></td> </tr> </tbody> </table> <p>There was a bug in the runtime that meant that when being passed into built-in APIs, invalid values were sometimes mistakenly coalesced with <code dir="auto">null</code>. Instead, a <code dir="auto">TypeError</code> should have been thrown. The <code dir="auto">dont_substitute_null_on_type_error</code> fixes this behavior so that an error is correctly thrown in these circumstances.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="minimal-subrequests">Minimal subrequests</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#minimal-subrequests"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2022-04-05</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>minimal_subrequests</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>no_minimal_subrequests</code></td> </tr> </tbody> </table> <p>With the <code dir="auto">minimal_subrequests</code> flag set, <code dir="auto">fetch()</code> subrequests sent to endpoints on the Worker's own zone (also called same-zone subrequests) have a reduced set of features applied to them. In general, these features should not have been initially applied to same-zone subrequests, and very few user-facing behavior changes are anticipated. Specifically, Workers might observe the following behavior changes with the new flag:</p> <ul> <li>Response bodies will not be opportunistically gzipped before being transmitted to the Workers runtime. If a Worker reads the response body, it will read it in plaintext, as has always been the case, so disabling this prevents unnecessary decompression. Meanwhile, if the Worker passes the response through to the client, Cloudflare's HTTP proxy will opportunistically gzip the response body on that side of the Workers runtime instead. The behavior change observable by a Worker script should be that some <code dir="auto">Content-Encoding: gzip</code> headers will no longer appear.</li> <li>Automatic Platform Optimization may previously have been applied on both the Worker's initiating request and its subrequests in some circumstances. It will now only apply to the initiating request.</li> <li>Link prefetching will now only apply to the Worker's response, not responses to the Worker's subrequests.</li> </ul> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="global-navigator">Global <code>navigator</code></h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#global-navigator"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2022-03-21</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>global_navigator</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>no_global_navigator</code></td> </tr> </tbody> </table> <p>With the <code dir="auto">global_navigator</code> flag set, a new global <code dir="auto">navigator</code> property is available from within Workers. Currently, it exposes only a single <code dir="auto">navigator.userAgent</code> property whose value is set to <code dir="auto">'Cloudflare-Workers'</code>. This property can be used to reliably determine whether code is running within the Workers environment.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="do-not-use-the-custom-origin-trust-store-for-external-subrequests">Do not use the Custom Origin Trust Store for external subrequests</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#do-not-use-the-custom-origin-trust-store-for-external-subrequests"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2022-03-08</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>no_cots_on_external_fetch</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>cots_on_external_fetch</code></td> </tr> </tbody> </table> <p>The <code dir="auto">no_cots_on_external_fetch</code> flag disables the use of the <a href="https://developers-cloudflare-com.translate.goog/ssl/origin-configuration/custom-origin-trust-store/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB">Custom Origin Trust Store</a> when making external (grey-clouded) subrequests from a Cloudflare Worker.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="settersgetters-on-api-object-prototypes">Setters/getters on API object prototypes</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#settersgetters-on-api-object-prototypes"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2022-01-31</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>workers_api_getters_setters_on_prototype</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>workers_api_getters_setters_on_instance</code></td> </tr> </tbody> </table> <p>Originally, properties on Workers API objects were defined as instance properties as opposed to prototype properties. This broke subclassing at the JavaScript layer, preventing a subclass from correctly overriding the superclass getters/setters. This flag controls the breaking change made to set those getters/setters on the prototype template instead.</p> <p>This changes applies to:</p> <ul> <li><code dir="auto">AbortSignal</code></li> <li><code dir="auto">AbortController</code></li> <li><code dir="auto">Blob</code></li> <li><code dir="auto">Body</code></li> <li><code dir="auto">DigestStream</code></li> <li><code dir="auto">Event</code></li> <li><code dir="auto">File</code></li> <li><code dir="auto">Request</code></li> <li><code dir="auto">ReadableStream</code></li> <li><code dir="auto">ReadableStreamDefaultReader</code></li> <li><code dir="auto">ReadableStreamBYOBReader</code></li> <li><code dir="auto">Response</code></li> <li><code dir="auto">TextDecoder</code></li> <li><code dir="auto">TextEncoder</code></li> <li><code dir="auto">TransformStream</code></li> <li><code dir="auto">URL</code></li> <li><code dir="auto">WebSocket</code></li> <li><code dir="auto">WritableStream</code></li> <li><code dir="auto">WritableStreamDefaultWriter</code></li> </ul> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="durable-object-stubfetch-requires-a-full-url">Durable Object <code>stub.fetch()</code> requires a full URL</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#durable-object-stubfetch-requires-a-full-url"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2021-11-10</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>durable_object_fetch_requires_full_url</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>durable_object_fetch_allows_relative_url</code></td> </tr> </tbody> </table> <p>Originally, when making a request to a Durable Object by calling <code dir="auto">stub.fetch(url)</code>, a relative URL was accepted as an input. The URL would be interpreted relative to the dummy URL <code dir="auto">http://fake-host</code>, and the resulting absolute URL was delivered to the destination object's <code dir="auto">fetch()</code> handler. This was a mistake — full URLs were meant to be required. This flag makes full URLs required.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="fetch-improperly-interprets-unknown-protocols-as-http"><code>fetch()</code> improperly interprets unknown protocols as HTTP</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#fetch-improperly-interprets-unknown-protocols-as-http"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2021-11-10</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>fetch_refuses_unknown_protocols</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>fetch_treats_unknown_protocols_as_http</code></td> </tr> </tbody> </table> <p>Originally, if the <code dir="auto">fetch()</code> function was passed a URL specifying any protocol other than <code dir="auto">http:</code> or <code dir="auto">https:</code>, it would silently treat it as if it were <code dir="auto">http:</code>. For example, <code dir="auto">fetch()</code> would appear to accept <code dir="auto">ftp:</code> URLs, but it was actually making HTTP requests instead.</p> <p>Note that Cloudflare Workers supports a non-standard extension to <code dir="auto">fetch()</code> to make it support WebSockets. However, when making an HTTP request that is intended to initiate a WebSocket handshake, you should still use <code dir="auto">http:</code> or <code dir="auto">https:</code> as the protocol, not <code dir="auto">ws:</code> nor <code dir="auto">wss:</code>.</p> <p>The <code dir="auto">ws:</code> and <code dir="auto">wss:</code> URL schemes are intended to be used together with the <code dir="auto">new WebSocket()</code> constructor, which exclusively supports WebSocket. The extension to <code dir="auto">fetch()</code> is designed to support HTTP and WebSocket in the same request (the response may or may not choose to initiate a WebSocket), and so all requests are considered to be HTTP.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="streams-byob-reader-detaches-buffer">Streams BYOB reader detaches buffer</h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#streams-byob-reader-detaches-buffer"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2021-11-10</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>streams_byob_reader_detaches_buffer</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>streams_byob_reader_does_not_detach_buffer</code></td> </tr> </tbody> </table> <p>Originally, the Workers runtime did not detach the <code dir="auto">ArrayBuffer</code>s from user-provided TypedArrays when using the <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/streams/readablestreambyobreader/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#methods">BYOB reader's <code dir="auto">read()</code> method</a>, as required by the Streams spec, meaning it was possible to inadvertently reuse the same buffer for multiple <code dir="auto">read()</code> calls. This change makes Workers conform to the spec.</p> <p>User code should never try to reuse an <code dir="auto">ArrayBuffer</code> that has been passed into a <a href="https://developers-cloudflare-com.translate.goog/workers/runtime-apis/streams/readablestreambyobreader/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#methods">BYOB reader's <code dir="auto">read()</code> method</a>. Instead, user code can reuse the <code dir="auto">ArrayBuffer</code> backing the result of the <code dir="auto">read()</code> promise, as in the example below.</p> <div class="expressive-code"> <link rel="stylesheet" href="/_astro/ec.rt9t7.css"> <script type="module" src="/_astro/ec.8zarh.js"></script> <figure class="frame not-content"> <figcaption class="header"></figcaption> <pre data-language="js"><code> <div class="ec-line"> <div class="code"> <span style="--0:#A9A9A5;--0fs:italic;--1:#62676A;--1fs:italic">// Consume and discard `readable` using a single 4KiB buffer.</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#EE9080;--1:#8F1500">let</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#D5D7D8;--1:#8F1500">reader</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">=</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EEFFFF;--1:#00268F">readable</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#57C78F;--1:#00783C">getReader</span><span style="--0:#EE9080;--1:#32008F">(</span><span style="--0:#89DDFF;--1:#007474">{</span><span style="--0:#EE9080;--1:#32008F"> mode</span><span style="--0:#89DDFF;--1:#007474">:</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#FDDA68;--1:#A84E00">"byob"</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#89DDFF;--1:#007474">}</span><span style="--0:#EE9080;--1:#32008F">)</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#EE9080;--1:#8F1500">let</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#D5D7D8;--1:#8F1500">arrayBufferView</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">=</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">new</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#57C78F;--1:#00783C">Uint8Array</span><span style="--0:#EE9080;--1:#32008F">(</span><span style="--0:#B59EE1;--1:#7C008F">4096</span><span style="--0:#EE9080;--1:#32008F">)</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#EE9080;--1:#8F1500">while</span><span style="--0:#EEFFFF;--1:#62676A"> (</span><span style="--0:#EE9080;--1:#32008F">true</span><span style="--0:#EEFFFF;--1:#62676A">) </span><span style="--0:#89DDFF;--1:#007474">{</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#EE9080;--1:#8F1500">let</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#D5D7D8;--1:#8F1500">result</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">=</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EE9080;--1:#8F1500">await</span><span style="--0:#EE9080;--1:#32008F"> </span><span style="--0:#EEFFFF;--1:#00268F">reader</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#57C78F;--1:#00783C">read</span><span style="--0:#EE9080;--1:#32008F">(</span><span style="--0:#D5D7D8;--1:#8F1500">arrayBufferView</span><span style="--0:#EE9080;--1:#32008F">)</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#EE9080;--1:#8F1500">if</span><span style="--0:#EEFFFF;--1:#62676A"> (</span><span style="--0:#EEFFFF;--1:#00268F">result</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#EEFFFF;--1:#00268F">done</span><span style="--0:#EEFFFF;--1:#62676A">) </span><span style="--0:#EE9080;--1:#8F1500">break</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#A9A9A5;--0fs:italic;--1:#62676A;--1fs:italic">// Optionally something with `result` here.</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#A9A9A5;--0fs:italic;--1:#62676A;--1fs:italic">// Re-use the same memory for the next `read()` by creating</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#A9A9A5;--0fs:italic;--1:#62676A;--1fs:italic">// a new Uint8Array backed by the result's ArrayBuffer.</span> </div> </div> <div class="ec-line"> <div class="code"> <span class="indent"> </span><span style="--0:#D5D7D8;--1:#8F1500">arrayBufferView</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#EE9080;--1:#8F1500">=</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#EE9080;--1:#8F1500">new</span><span style="--0:#EEFFFF;--1:#62676A"> </span><span style="--0:#57C78F;--1:#00783C">Uint8Array</span><span style="--0:#EEFFFF;--1:#62676A">(</span><span style="--0:#EEFFFF;--1:#00268F">result</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#EEFFFF;--1:#00268F">value</span><span style="--0:#89DDFF;--1:#007474">.</span><span style="--0:#EEFFFF;--1:#00268F">buffer</span><span style="--0:#EEFFFF;--1:#62676A">)</span><span style="--0:#89DDFF;--1:#007474">;</span> </div> </div> <div class="ec-line"> <div class="code"> <span style="--0:#89DDFF;--1:#007474">}</span> </div> </div></code></pre> <div class="copy"> <button title="Copy to clipboard" data-copied="Copied!" data-code="// Consume and discard `readable` using a single 4KiB buffer.let reader = readable.getReader({ mode: "byob" });let arrayBufferView = new Uint8Array(4096);while (true) { let result = await reader.read(arrayBufferView); if (result.done) break; // Optionally something with `result` here. // Re-use the same memory for the next `read()` by creating // a new Uint8Array backed by the result's ArrayBuffer. arrayBufferView = new Uint8Array(result.value.buffer);}"> <div></div></button> </div> </figure> </div> <p>The more recently added extension method <code dir="auto">readAtLeast()</code> will always detach the <code dir="auto">ArrayBuffer</code> and is unaffected by this feature flag setting.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="formdata-parsing-supports-file"><code>FormData</code> parsing supports <code>File</code></h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#formdata-parsing-supports-file"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Default as of</strong></td> <td>2021-11-03</td> </tr> <tr> <td><strong>Flag to enable</strong></td> <td><code>formdata_parser_supports_files</code></td> </tr> <tr> <td><strong>Flag to disable</strong></td> <td><code>formdata_parser_converts_files_to_strings</code></td> </tr> </tbody> </table> <p><a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://developer.mozilla.org/en-US/docs/Web/API/FormData" target="_blank" rel="noopener">The <code dir="auto">FormData</code> API<span class="external-link"> ↗</span></a> is used to parse data (especially HTTP request bodies) in <code dir="auto">multipart/form-data</code> format.</p> <p>Originally, the Workers runtime's implementation of the <code dir="auto">FormData</code> API incorrectly converted uploaded files to strings. Therefore, <code dir="auto">formData.get("filename")</code> would return a string containing the file contents instead of a <code dir="auto">File</code> object. This change fixes the problem, causing files to be represented using <code dir="auto">File</code> as specified in the standard.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="htmlrewriter-handling-of-esiinclude"><code>HTMLRewriter</code> handling of <code><esi:include></code></h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#htmlrewriter-handling-of-esiinclude"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Flag to enable</strong></td> <td><code>html_rewriter_treats_esi_include_as_void_tag</code></td> </tr> </tbody> </table> <p>The HTML5 standard defines a fixed set of elements as void elements, meaning they do not use an end tag: <code dir="auto"><area></code>, <code dir="auto"><base></code>, <code dir="auto"><br></code>, <code dir="auto"><col></code>, <code dir="auto"><command></code>, <code dir="auto"><embed></code>, <code dir="auto"><hr></code>, <code dir="auto"><img></code>, <code dir="auto"><input></code>, <code dir="auto"><keygen></code>, <code dir="auto"><link></code>, <code dir="auto"><meta></code>, <code dir="auto"><param></code>, <code dir="auto"><source></code>, <code dir="auto"><track></code>, and <code dir="auto"><wbr></code>.</p> <p>HTML5 does not recognize XML self-closing tag syntax. For example, <code dir="auto"><script src="foo.js" /></code> does not specify a script element with no body. A <code dir="auto"></script></code> ending tag is still required. The <code dir="auto">/></code> syntax simply is not recognized by HTML5 at all and it is treated the same as <code dir="auto">></code>. However, many developers still like to use this syntax, as a holdover from XHTML, a standard which failed to gain traction in the early 2000's.</p> <p><code dir="auto"><esi:include></code> and <code dir="auto"><esi:comment></code> are two tags that are not part of the HTML5 standard, but are instead used as part of <a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://en.wikipedia.org/wiki/Edge_Side_Includes" target="_blank" rel="noopener">Edge Side Includes<span class="external-link"> ↗</span></a>, a technology for server-side HTML modification. These tags are not expected to contain any body and are commonly written with XML self-closing syntax.</p> <p><code dir="auto">HTMLRewriter</code> was designed to parse standard HTML5, not ESI. However, it would be useful to be able to implement some parts of ESI using <code dir="auto">HTMLRewriter</code>. To that end, this compatibility flag causes <code dir="auto">HTMLRewriter</code> to treat <code dir="auto"><esi:include></code> and <code dir="auto"><esi:comment></code> as void tags, so that they can be parsed and handled properly.</p> <div tabindex="-1" class="heading-wrapper level-h2"> <h2 id="experimental-flags">Experimental flags</h2><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#experimental-flags"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <p>These flags can be enabled via <code dir="auto">compatibility_flags</code>, but are not yet scheduled to become default on any particular date.</p> <div tabindex="-1" class="heading-wrapper level-h3"> <h3 id="htmlrewriter-handling-of-esiinclude"><code>HTMLRewriter</code> handling of <code><esi:include></code></h3><a class="anchor-link" href="https://developers-cloudflare-com.translate.goog/workers/configuration/compatibility-flags/?_x_tr_sl=pl&_x_tr_tl=en&_x_tr_hl=en-GB#htmlrewriter-handling-of-esiinclude"><span aria-hidden="true" class="anchor-icon"> <svg width="16" height="16" viewbox="0 0 24 24"> <path fill="currentcolor" d="m12.11 15.39-3.88 3.88a2.52 2.52 0 0 1-3.5 0 2.47 2.47 0 0 1 0-3.5l3.88-3.88a1 1 0 0 0-1.42-1.42l-3.88 3.89a4.48 4.48 0 0 0 6.33 6.33l3.89-3.88a1 1 0 1 0-1.42-1.42Zm8.58-12.08a4.49 4.49 0 0 0-6.33 0l-3.89 3.88a1 1 0 0 0 1.42 1.42l3.88-3.88a2.52 2.52 0 0 1 3.5 0 2.47 2.47 0 0 1 0 3.5l-3.88 3.88a1 1 0 1 0 1.42 1.42l3.88-3.89a4.49 4.49 0 0 0 0-6.33ZM8.83 15.17a1 1 0 0 0 1.1.22 1 1 0 0 0 .32-.22l4.92-4.92a1 1 0 0 0-1.42-1.42l-4.92 4.92a1 1 0 0 0 0 1.42Z" /> </svg></span></a> </div> <table> <tbody> <tr> <td><strong>Flag to enable</strong></td> <td><code>html_rewriter_treats_esi_include_as_void_tag</code></td> </tr> </tbody> </table> <p>The HTML5 standard defines a fixed set of elements as void elements, meaning they do not use an end tag: <code dir="auto"><area></code>, <code dir="auto"><base></code>, <code dir="auto"><br></code>, <code dir="auto"><col></code>, <code dir="auto"><command></code>, <code dir="auto"><embed></code>, <code dir="auto"><hr></code>, <code dir="auto"><img></code>, <code dir="auto"><input></code>, <code dir="auto"><keygen></code>, <code dir="auto"><link></code>, <code dir="auto"><meta></code>, <code dir="auto"><param></code>, <code dir="auto"><source></code>, <code dir="auto"><track></code>, and <code dir="auto"><wbr></code>.</p> <p>HTML5 does not recognize XML self-closing tag syntax. For example, <code dir="auto"><script src="foo.js" /></code> does not specify a script element with no body. A <code dir="auto"></script></code> ending tag is still required. The <code dir="auto">/></code> syntax simply is not recognized by HTML5 at all and it is treated the same as <code dir="auto">></code>. However, many developers still like to use this syntax, as a holdover from XHTML, a standard which failed to gain traction in the early 2000's.</p> <p><code dir="auto"><esi:include></code> and <code dir="auto"><esi:comment></code> are two tags that are not part of the HTML5 standard, but are instead used as part of <a href="https://translate.google.com/website?sl=pl&tl=en&hl=en-GB&u=https://en.wikipedia.org/wiki/Edge_Side_Includes" target="_blank" rel="noopener">Edge Side Includes<span class="external-link"> ↗</span></a>, a technology for server-side HTML modification. These tags are not expected to contain any body and are commonly written with XML self-closing syntax.</p> <p><code dir="auto">HTMLRewriter</code> was designed to parse standard HTML5, not ESI. However, it would be useful to be able to implement some parts of ESI using <code dir="auto">HTMLRewriter</code>. 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