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typeof="ListItem"><a href="/en-US/docs/Web/HTTP" class="breadcrumb" property="item" typeof="WebPage"><span property="name">HTTP</span></a><meta property="position" content="2"/></li><li property="itemListElement" typeof="ListItem"><a href="/en-US/docs/Web/HTTP/MIME_types" class="breadcrumb-current-page" property="item" typeof="WebPage"><span property="name">MIME types (IANA media types)</span></a><meta property="position" content="3"/></li></ol></nav><div class="article-actions"><button type="button" class="button action has-icon article-actions-toggle" aria-label="Article actions"><span class="button-wrap"><span class="icon icon-ellipses "></span><span class="article-actions-dialog-heading">Article Actions</span></span></button><ul class="article-actions-entries"><li class="article-actions-entry"><div class="languages-switcher-menu open-on-focus-within"><button id="languages-switcher-button" type="button" class="button action small has-icon languages-switcher-menu" aria-haspopup="menu"><span class="button-wrap"><span class="icon icon-language "></span>English (US)</span></button><div class="hidden"><ul class="submenu language-menu " aria-labelledby="language-menu-button"><li class=" "><form class="submenu-item locale-redirect-setting"><div class="group"><label class="switch"><input type="checkbox" name="locale-redirect"/><span class="slider"></span><span class="label">Remember language</span></label><a href="https://github.com/orgs/mdn/discussions/739" rel="external noopener noreferrer" target="_blank" title="Enable this setting to automatically switch to this language when it's available. (Click to learn more.)"><span class="icon icon-question-mark "></span></a></div></form></li><li class=" "><a data-locale="de" href="/de/docs/Web/HTTP/MIME_types" class="button submenu-item"><span>Deutsch</span><span title="Diese Übersetzung ist Teil eines Experiments."><span class="icon icon-experimental "></span></span></a></li><li class=" "><a data-locale="es" href="/es/docs/Web/HTTP/MIME_types" class="button submenu-item"><span>Español</span></a></li><li class=" "><a data-locale="fr" href="/fr/docs/Web/HTTP/MIME_types" class="button submenu-item"><span>Français</span></a></li><li class=" "><a data-locale="ja" href="/ja/docs/Web/HTTP/MIME_types" class="button submenu-item"><span>日本語</span></a></li><li class=" "><a data-locale="ko" href="/ko/docs/Web/HTTP/MIME_types" class="button submenu-item"><span>한국어</span></a></li><li class=" "><a data-locale="pt-BR" href="/pt-BR/docs/Web/HTTP/MIME_types" class="button submenu-item"><span>Português (do Brasil)</span></a></li><li class=" "><a 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value=""/><button type="button" class="button action has-icon clear-sidebar-filter-button"><span class="button-wrap"><span class="icon icon-cancel "></span><span class="visually-hidden">Clear filter input</span></span></button></div></section></header><div class="sidebar-inner-nav"><div class="in-nav-toc"><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In this article</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#structure_of_a_mime_type">Structure of a MIME type</a></li><li class="document-toc-item "><a class="document-toc-link" href="#important_mime_types_for_web_developers">Important MIME types for Web developers</a></li><li class="document-toc-item "><a class="document-toc-link" href="#importance_of_setting_the_correct_mime_type">Importance of setting the correct MIME type</a></li><li class="document-toc-item "><a class="document-toc-link" href="#mime_sniffing">MIME sniffing</a></li><li class="document-toc-item "><a class="document-toc-link" href="#other_methods_of_conveying_document_type">Other methods of conveying document type</a></li><li class="document-toc-item "><a class="document-toc-link" href="#see_also">See also</a></li></ul></section></div></div><div class="sidebar-body"><ol><li class="section"><a href="/en-US/docs/Web/HTTP">HTTP</a></li><li class="section">Guides</li><li><a href="/en-US/docs/Web/HTTP/Overview">An overview of HTTP</a></li><li><a href="/en-US/docs/Web/HTTP/Session">A typical HTTP session</a></li><li><a href="/en-US/docs/Web/HTTP/Messages">HTTP messages</a></li><li><em><a href="/en-US/docs/Web/HTTP/MIME_types" aria-current="page">MIME types (IANA media types)</a></em></li><li><a href="/en-US/docs/Web/HTTP/Compression">Compression in HTTP</a></li><li><a href="/en-US/docs/Web/HTTP/Caching">HTTP caching</a></li><li><a href="/en-US/docs/Web/HTTP/Authentication">HTTP authentication</a></li><li><a href="/en-US/docs/Web/HTTP/Cookies">Using HTTP cookies</a></li><li><a href="/en-US/docs/Web/HTTP/Redirections">Redirections in HTTP</a></li><li><a href="/en-US/docs/Web/HTTP/Conditional_requests">HTTP conditional requests</a></li><li><a href="/en-US/docs/Web/HTTP/Range_requests">HTTP range requests</a></li><li><a href="/en-US/docs/Web/HTTP/Content_negotiation">Content negotiation</a></li><li><a href="/en-US/docs/Web/HTTP/Connection_management_in_HTTP_1.x">Connection management in HTTP/1.x</a></li><li><a href="/en-US/docs/Web/HTTP/Evolution_of_HTTP">Evolution of HTTP</a></li><li><a href="/en-US/docs/Web/HTTP/Protocol_upgrade_mechanism">Protocol upgrade mechanism</a></li><li><a href="/en-US/docs/Web/HTTP/Proxy_servers_and_tunneling">Proxy servers and tunneling</a></li><li><a href="/en-US/docs/Web/HTTP/Client_hints">HTTP Client hints</a></li><li class="toggle"><details><summary>Security and privacy</summary><ol><li><a href="/en-US/docs/Web/Security/Practical_implementation_guides">Practical security implementation guides</a></li><li><a href="/en-US/observatory">HTTP Observatory</a></li><li><a href="/en-US/docs/Web/HTTP/Permissions_Policy">Permissions Policy</a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/CSP">Content Security Policy (CSP)</a></li><li><a href="/en-US/docs/Web/HTTP/CORS">Cross-Origin Resource Sharing (CORS)</a></li><li><a href="/en-US/docs/Web/HTTP/Cross-Origin_Resource_Policy">Cross-Origin Resource Policy (CORP)</a></li><li><a href="/en-US/docs/Web/HTTP/Headers">Headers</a></li></ol></details></li><li class="section">References</li><li class="toggle"><details><summary>HTTP headers</summary><ol><li><a href="/en-US/docs/Web/HTTP/Headers/Accept"><code>Accept</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Accept-CH"><code>Accept-CH</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Accept-Encoding"><code>Accept-Encoding</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Accept-Language"><code>Accept-Language</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Accept-Patch"><code>Accept-Patch</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Accept-Post"><code>Accept-Post</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Accept-Ranges"><code>Accept-Ranges</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Credentials"><code>Access-Control-Allow-Credentials</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Headers"><code>Access-Control-Allow-Headers</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Methods"><code>Access-Control-Allow-Methods</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Origin"><code>Access-Control-Allow-Origin</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Access-Control-Expose-Headers"><code>Access-Control-Expose-Headers</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Access-Control-Max-Age"><code>Access-Control-Max-Age</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Access-Control-Request-Headers"><code>Access-Control-Request-Headers</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Access-Control-Request-Method"><code>Access-Control-Request-Method</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Age"><code>Age</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Allow"><code>Allow</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Alt-Svc"><code>Alt-Svc</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Alt-Used"><code>Alt-Used</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Attribution-Reporting-Eligible"><code>Attribution-Reporting-Eligible</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Attribution-Reporting-Register-Source"><code>Attribution-Reporting-Register-Source</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Attribution-Reporting-Register-Trigger"><code>Attribution-Reporting-Register-Trigger</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Authorization"><code>Authorization</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Cache-Control"><code>Cache-Control</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Clear-Site-Data"><code>Clear-Site-Data</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Connection"><code>Connection</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Digest"><code>Content-Digest</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Disposition"><code>Content-Disposition</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-DPR"><code>Content-DPR</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Encoding"><code>Content-Encoding</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Language"><code>Content-Language</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Length"><code>Content-Length</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Location"><code>Content-Location</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Range"><code>Content-Range</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy"><code>Content-Security-Policy</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only"><code>Content-Security-Policy-Report-Only</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Type"><code>Content-Type</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Cookie"><code>Cookie</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Critical-CH"><code>Critical-CH</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Cross-Origin-Embedder-Policy"><code>Cross-Origin-Embedder-Policy</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Cross-Origin-Opener-Policy"><code>Cross-Origin-Opener-Policy</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Cross-Origin-Resource-Policy"><code>Cross-Origin-Resource-Policy</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Date"><code>Date</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Device-Memory"><code>Device-Memory</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/DNT"><code>DNT</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Downlink"><code>Downlink</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/DPR"><code>DPR</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Early-Data"><code>Early-Data</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/ECT"><code>ECT</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/ETag"><code>ETag</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Expect"><code>Expect</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Expect-CT"><code>Expect-CT</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Expires"><code>Expires</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Forwarded"><code>Forwarded</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/From"><code>From</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Host"><code>Host</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/If-Match"><code>If-Match</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/If-Modified-Since"><code>If-Modified-Since</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/If-None-Match"><code>If-None-Match</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/If-Range"><code>If-Range</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/If-Unmodified-Since"><code>If-Unmodified-Since</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Keep-Alive"><code>Keep-Alive</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Last-Modified"><code>Last-Modified</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Link"><code>Link</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Location"><code>Location</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Max-Forwards"><code>Max-Forwards</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/NEL"><code>NEL</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/No-Vary-Search"><code>No-Vary-Search</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Observe-Browsing-Topics"><code>Observe-Browsing-Topics</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Origin"><code>Origin</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Origin-Agent-Cluster"><code>Origin-Agent-Cluster</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy"><code>Permissions-Policy</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Pragma"><code>Pragma</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Priority"><code>Priority</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Proxy-Authenticate"><code>Proxy-Authenticate</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Proxy-Authorization"><code>Proxy-Authorization</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Range"><code>Range</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Referer"><code>Referer</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Referrer-Policy"><code>Referrer-Policy</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Refresh"><code>Refresh</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Report-To"><code>Report-To</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Reporting-Endpoints"><code>Reporting-Endpoints</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Repr-Digest"><code>Repr-Digest</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Retry-After"><code>Retry-After</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/RTT"><code>RTT</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Save-Data"><code>Save-Data</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-Browsing-Topics"><code>Sec-Browsing-Topics</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Color-Scheme"><code>Sec-CH-Prefers-Color-Scheme</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Motion"><code>Sec-CH-Prefers-Reduced-Motion</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Transparency"><code>Sec-CH-Prefers-Reduced-Transparency</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-CH-UA"><code>Sec-CH-UA</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Arch"><code>Sec-CH-UA-Arch</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Bitness"><code>Sec-CH-UA-Bitness</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Form-Factors"><code>Sec-CH-UA-Form-Factors</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Full-Version"><code>Sec-CH-UA-Full-Version</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Full-Version-List"><code>Sec-CH-UA-Full-Version-List</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Mobile"><code>Sec-CH-UA-Mobile</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Model"><code>Sec-CH-UA-Model</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Platform"><code>Sec-CH-UA-Platform</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Platform-Version"><code>Sec-CH-UA-Platform-Version</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-WoW64"><code>Sec-CH-UA-WoW64</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-Fetch-Dest"><code>Sec-Fetch-Dest</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-Fetch-Mode"><code>Sec-Fetch-Mode</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-Fetch-Site"><code>Sec-Fetch-Site</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-Fetch-User"><code>Sec-Fetch-User</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-GPC"><code>Sec-GPC</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-Purpose"><code>Sec-Purpose</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-WebSocket-Accept"><code>Sec-WebSocket-Accept</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-WebSocket-Extensions"><code>Sec-WebSocket-Extensions</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-WebSocket-Key"><code>Sec-WebSocket-Key</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-WebSocket-Protocol"><code>Sec-WebSocket-Protocol</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Sec-WebSocket-Version"><code>Sec-WebSocket-Version</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Server"><code>Server</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Server-Timing"><code>Server-Timing</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Service-Worker"><code>Service-Worker</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Service-Worker-Allowed"><code>Service-Worker-Allowed</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Service-Worker-Navigation-Preload"><code>Service-Worker-Navigation-Preload</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Set-Cookie"><code>Set-Cookie</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Set-Login"><code>Set-Login</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/SourceMap"><code>SourceMap</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Speculation-Rules"><code>Speculation-Rules</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security"><code>Strict-Transport-Security</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Supports-Loading-Mode"><code>Supports-Loading-Mode</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/TE"><code>TE</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Timing-Allow-Origin"><code>Timing-Allow-Origin</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Tk"><code>Tk</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Trailer"><code>Trailer</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Transfer-Encoding"><code>Transfer-Encoding</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Upgrade"><code>Upgrade</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Upgrade-Insecure-Requests"><code>Upgrade-Insecure-Requests</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/User-Agent"><code>User-Agent</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Vary"><code>Vary</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Via"><code>Via</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Viewport-Width"><code>Viewport-Width</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Want-Content-Digest"><code>Want-Content-Digest</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Want-Repr-Digest"><code>Want-Repr-Digest</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Warning"><code>Warning</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Width"><code>Width</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/WWW-Authenticate"><code>WWW-Authenticate</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options"><code>X-Content-Type-Options</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control"><code>X-DNS-Prefetch-Control</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/X-Forwarded-For"><code>X-Forwarded-For</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/X-Forwarded-Host"><code>X-Forwarded-Host</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/X-Forwarded-Proto"><code>X-Forwarded-Proto</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/X-Frame-Options"><code>X-Frame-Options</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/X-Permitted-Cross-Domain-Policies"><code>X-Permitted-Cross-Domain-Policies</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/X-Powered-By"><code>X-Powered-By</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/X-Robots-Tag"><code>X-Robots-Tag</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/X-XSS-Protection"><code>X-XSS-Protection</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li></ol></details></li><li class="toggle"><details><summary>HTTP request methods</summary><ol><li><a href="/en-US/docs/Web/HTTP/Methods/CONNECT"><code>CONNECT</code></a></li><li><a href="/en-US/docs/Web/HTTP/Methods/DELETE"><code>DELETE</code></a></li><li><a href="/en-US/docs/Web/HTTP/Methods/GET"><code>GET</code></a></li><li><a href="/en-US/docs/Web/HTTP/Methods/HEAD"><code>HEAD</code></a></li><li><a href="/en-US/docs/Web/HTTP/Methods/OPTIONS"><code>OPTIONS</code></a></li><li><a href="/en-US/docs/Web/HTTP/Methods/PATCH"><code>PATCH</code></a></li><li><a href="/en-US/docs/Web/HTTP/Methods/POST"><code>POST</code></a></li><li><a href="/en-US/docs/Web/HTTP/Methods/PUT"><code>PUT</code></a></li><li><a href="/en-US/docs/Web/HTTP/Methods/TRACE"><code>TRACE</code></a></li></ol></details></li><li class="toggle"><details><summary>HTTP response status codes</summary><ol><li><a href="/en-US/docs/Web/HTTP/Status/100"><code>100 Continue</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/101"><code>101 Switching Protocols</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/102"><code>102 Processing</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/103"><code>103 Early Hints</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/200"><code>200 OK</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/201"><code>201 Created</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/202"><code>202 Accepted</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/203"><code>203 Non-Authoritative Information</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/204"><code>204 No Content</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/205"><code>205 Reset Content</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/206"><code>206 Partial Content</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/207"><code>207 Multi-Status</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/208"><code>208 Already Reported</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/226"><code>226 IM Used</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/300"><code>300 Multiple Choices</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/301"><code>301 Moved Permanently</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/302"><code>302 Found</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/303"><code>303 See Other</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/304"><code>304 Not Modified</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/307"><code>307 Temporary Redirect</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/308"><code>308 Permanent Redirect</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/400"><code>400 Bad Request</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/401"><code>401 Unauthorized</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/402"><code>402 Payment Required</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/403"><code>403 Forbidden</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/404"><code>404 Not Found</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/405"><code>405 Method Not Allowed</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/406"><code>406 Not Acceptable</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/407"><code>407 Proxy Authentication Required</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/408"><code>408 Request Timeout</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/409"><code>409 Conflict</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/410"><code>410 Gone</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/411"><code>411 Length Required</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/412"><code>412 Precondition Failed</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/413"><code>413 Content Too Large</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/414"><code>414 URI Too Long</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/415"><code>415 Unsupported Media Type</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/416"><code>416 Range Not Satisfiable</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/417"><code>417 Expectation Failed</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/418"><code>418 I'm a teapot</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/421"><code>421 Misdirected Request</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/422"><code>422 Unprocessable Content</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/423"><code>423 Locked</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/424"><code>424 Failed Dependency</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/425"><code>425 Too Early</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/426"><code>426 Upgrade Required</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/428"><code>428 Precondition Required</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/429"><code>429 Too Many Requests</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/431"><code>431 Request Header Fields Too Large</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/451"><code>451 Unavailable For Legal Reasons</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/500"><code>500 Internal Server Error</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/501"><code>501 Not Implemented</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/502"><code>502 Bad Gateway</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/503"><code>503 Service Unavailable</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/504"><code>504 Gateway Timeout</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/505"><code>505 HTTP Version Not Supported</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/506"><code>506 Variant Also Negotiates</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/507"><code>507 Insufficient Storage</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/508"><code>508 Loop Detected</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/510"><code>510 Not Extended</code></a></li><li><a href="/en-US/docs/Web/HTTP/Status/511"><code>511 Network Authentication Required</code></a></li></ol></details></li><li class="toggle"><details><summary>CSP directives</summary><ol><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/base-uri"><code>CSP: base-uri</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/block-all-mixed-content"><code>CSP: block-all-mixed-content</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/child-src"><code>CSP: child-src</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/connect-src"><code>CSP: connect-src</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/default-src"><code>CSP: default-src</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/fenced-frame-src"><code>CSP: fenced-frame-src</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/font-src"><code>CSP: font-src</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/form-action"><code>CSP: form-action</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/frame-ancestors"><code>CSP: frame-ancestors</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/frame-src"><code>CSP: frame-src</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/img-src"><code>CSP: img-src</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/manifest-src"><code>CSP: manifest-src</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/media-src"><code>CSP: media-src</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/object-src"><code>CSP: object-src</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/prefetch-src"><code>CSP: prefetch-src</code></a><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/report-to"><code>CSP: report-to</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/report-uri"><code>CSP: report-uri</code></a><abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/require-trusted-types-for"><code>CSP: require-trusted-types-for</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/sandbox"><code>CSP: sandbox</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src"><code>CSP: script-src</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src-attr"><code>CSP: script-src-attr</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src-elem"><code>CSP: script-src-elem</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style-src"><code>CSP: style-src</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style-src-attr"><code>CSP: style-src-attr</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style-src-elem"><code>CSP: style-src-elem</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/trusted-types"><code>CSP: trusted-types</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/upgrade-insecure-requests"><code>CSP: upgrade-insecure-requests</code></a></li><li><a href="/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/worker-src"><code>CSP: worker-src</code></a></li></ol></details></li><li class="toggle"><details><summary>CORS errors</summary><ol><li><a href="/en-US/docs/Web/HTTP/CORS/Errors/CORSDisabled"><code>Reason: CORS disabled</code></a></li><li><a href="/en-US/docs/Web/HTTP/CORS/Errors/CORSAllowOriginNotMatchingOrigin"><code>Reason: CORS header 'Access-Control-Allow-Origin' does not match 'xyz'</code></a></li><li><a href="/en-US/docs/Web/HTTP/CORS/Errors/CORSMissingAllowOrigin"><code>Reason: CORS header 'Access-Control-Allow-Origin' missing</code></a></li><li><a href="/en-US/docs/Web/HTTP/CORS/Errors/CORSOriginHeaderNotAdded"><code>Reason: CORS header 'Origin' cannot be added</code></a></li><li><a href="/en-US/docs/Web/HTTP/CORS/Errors/CORSPreflightDidNotSucceed"><code>Reason: CORS preflight channel did not succeed</code></a></li><li><a href="/en-US/docs/Web/HTTP/CORS/Errors/CORSDidNotSucceed"><code>Reason: CORS request did not succeed</code></a></li><li><a href="/en-US/docs/Web/HTTP/CORS/Errors/CORSExternalRedirectNotAllowed"><code>Reason: CORS request external redirect not allowed</code></a></li><li><a href="/en-US/docs/Web/HTTP/CORS/Errors/CORSRequestNotHttp"><code>Reason: CORS request not HTTP</code></a></li><li><a href="/en-US/docs/Web/HTTP/CORS/Errors/CORSNotSupportingCredentials"><code>Reason: Credential is not supported if the CORS header 'Access-Control-Allow-Origin' is '*'</code></a></li><li><a href="/en-US/docs/Web/HTTP/CORS/Errors/CORSMethodNotFound"><code>Reason: Did not find method in CORS header 'Access-Control-Allow-Methods'</code></a></li><li><a href="/en-US/docs/Web/HTTP/CORS/Errors/CORSMIssingAllowCredentials"><code>Reason: expected 'true' in CORS header 'Access-Control-Allow-Credentials'</code></a></li><li><a href="/en-US/docs/Web/HTTP/CORS/Errors/CORSInvalidAllowHeader"><code>Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Headers'</code></a></li><li><a href="/en-US/docs/Web/HTTP/CORS/Errors/CORSInvalidAllowMethod"><code>Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Methods'</code></a></li><li><a href="/en-US/docs/Web/HTTP/CORS/Errors/CORSMissingAllowHeaderFromPreflight"><code>Reason: missing token 'xyz' in CORS header 'Access-Control-Allow-Headers' from CORS preflight channel</code></a></li><li><a href="/en-US/docs/Web/HTTP/CORS/Errors/CORSMultipleAllowOriginNotAllowed"><code>Reason: Multiple CORS header 'Access-Control-Allow-Origin' not allowed</code></a></li></ol></details></li><li class="toggle"><details><summary>Permissions-Policy directives</summary><ol><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/accelerometer"><code>Permissions-Policy: accelerometer</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/ambient-light-sensor"><code>Permissions-Policy: ambient-light-sensor</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/attribution-reporting"><code>Permissions-Policy: attribution-reporting</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/autoplay"><code>Permissions-Policy: autoplay</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/bluetooth"><code>Permissions-Policy: bluetooth</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/browsing-topics"><code>Permissions-Policy: browsing-topics</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr><abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/camera"><code>Permissions-Policy: camera</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/compute-pressure"><code>Permissions-Policy: compute-pressure</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/cross-origin-isolated"><code>Permissions-Policy: cross-origin-isolated</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/display-capture"><code>Permissions-Policy: display-capture</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/document-domain"><code>Permissions-Policy: document-domain</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/encrypted-media"><code>Permissions-Policy: encrypted-media</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/fullscreen"><code>Permissions-Policy: fullscreen</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/gamepad"><code>Permissions-Policy: gamepad</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/geolocation"><code>Permissions-Policy: geolocation</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/gyroscope"><code>Permissions-Policy: gyroscope</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/hid"><code>Permissions-Policy: hid</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/identity-credentials-get"><code>Permissions-Policy: identity-credentials-get</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/idle-detection"><code>Permissions-Policy: idle-detection</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/local-fonts"><code>Permissions-Policy: local-fonts</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/magnetometer"><code>Permissions-Policy: magnetometer</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/microphone"><code>Permissions-Policy: microphone</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/midi"><code>Permissions-Policy: midi</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/otp-credentials"><code>Permissions-Policy: otp-credentials</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/payment"><code>Permissions-Policy: payment</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/picture-in-picture"><code>Permissions-Policy: picture-in-picture</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/publickey-credentials-create"><code>Permissions-Policy: publickey-credentials-create</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/publickey-credentials-get"><code>Permissions-Policy: publickey-credentials-get</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/screen-wake-lock"><code>Permissions-Policy: screen-wake-lock</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/serial"><code>Permissions-Policy: serial</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/speaker-selection"><code>Permissions-Policy: speaker-selection</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/storage-access"><code>Permissions-Policy: storage-access</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/usb"><code>Permissions-Policy: usb</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/web-share"><code>Permissions-Policy: web-share</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/window-management"><code>Permissions-Policy: window-management</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li><li><a href="/en-US/docs/Web/HTTP/Headers/Permissions-Policy/xr-spatial-tracking"><code>Permissions-Policy: xr-spatial-tracking</code></a><abbr class="icon icon-experimental" title="Experimental. Expect behavior to change in the future."> <span class="visually-hidden">Experimental</span> </abbr></li></ol></details></li><li><a href="/en-US/docs/Web/HTTP/Resources_and_specifications">HTTP resources and specifications</a></li></ol></div></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In this article</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#structure_of_a_mime_type">Structure of a MIME type</a></li><li class="document-toc-item "><a class="document-toc-link" href="#important_mime_types_for_web_developers">Important MIME types for Web developers</a></li><li class="document-toc-item "><a class="document-toc-link" href="#importance_of_setting_the_correct_mime_type">Importance of setting the correct MIME type</a></li><li class="document-toc-item "><a class="document-toc-link" href="#mime_sniffing">MIME sniffing</a></li><li class="document-toc-item "><a class="document-toc-link" href="#other_methods_of_conveying_document_type">Other methods of conveying document type</a></li><li class="document-toc-item "><a class="document-toc-link" href="#see_also">See also</a></li></ul></section></div></nav></aside><section class="place side"></section></div></div><main id="content" class="main-content "><article class="main-page-content" lang="en-US"><header><h1>MIME types (IANA media types)</h1></header><div class="section-content"><p>A <strong>media type</strong> (also known as a <strong>Multipurpose Internet Mail Extensions or MIME type</strong>) indicates the nature and format of a document, file, or assortment of bytes. MIME types are defined and standardized in IETF's <a href="https://datatracker.ietf.org/doc/html/rfc6838" class="external" target="_blank">RFC 6838</a>.</p> <p>The <a href="https://www.iana.org/" class="external" target="_blank">Internet Assigned Numbers Authority (IANA)</a> is responsible for all official MIME types, and you can find the most up-to-date and complete list at their <a href="https://www.iana.org/assignments/media-types/media-types.xhtml" class="external" target="_blank">Media Types</a> page.</p> <div class="notecard warning"> <p><strong>Warning:</strong> Browsers use the MIME type, <em>not the file extension</em>, to determine how to process a URL, so it's important that web servers send the correct MIME type in the response's <a href="/en-US/docs/Web/HTTP/Headers/Content-Type"><code>Content-Type</code></a> header. If this is not correctly configured, browsers are likely to misinterpret the contents of files, sites will not work correctly, and downloaded files may be mishandled.</p> </div></div><section aria-labelledby="structure_of_a_mime_type"><h2 id="structure_of_a_mime_type"><a href="#structure_of_a_mime_type">Structure of a MIME type</a></h2><div class="section-content"><p>A MIME type most commonly consists of just two parts: a <em>type</em> and a <em>subtype</em>, separated by a slash (<code>/</code>) — with no whitespace between:</p> <pre class="brush: plain notranslate">type/subtype </pre> <p>The <strong><em>type</em></strong> represents the general category into which the data type falls, such as <code>video</code> or <code>text</code>.</p> <p>The <strong><em>subtype</em></strong> identifies the exact kind of data of the specified type the MIME type represents. For example, for the MIME type <code>text</code>, the subtype might be <code>plain</code> (plain text), <code>html</code> (<a href="/en-US/docs/Glossary/HTML">HTML</a> source code), or <code>calendar</code> (for iCalendar/<code>.ics</code>) files.</p> <p>Each type has its own set of possible subtypes. A MIME type always has both a type and a subtype, never just one or the other.</p> <p>An optional <strong>parameter</strong> can be added to provide additional details:</p> <pre class="brush: plain notranslate">type/subtype;parameter=value </pre> <p>For example, for any MIME type whose main type is <code>text</code>, you can add the optional <code>charset</code> parameter to specify the character set used for the characters in the data. If no <code>charset</code> is specified, the default is <a href="/en-US/docs/Glossary/ASCII">ASCII</a> (<code>US-ASCII</code>) unless overridden by the <a href="/en-US/docs/Glossary/User_agent">user agent's</a> settings. To specify a UTF-8 text file, the MIME type <code>text/plain;charset=UTF-8</code> is used.</p> <p>MIME types are case-insensitive but are traditionally written in lowercase. The parameter values can be case-sensitive.</p></div></section><section aria-labelledby="types"><h3 id="types"><a href="#types">Types</a></h3><div class="section-content"><p>There are two classes of type: <strong>discrete</strong> and <strong>multipart</strong>. Discrete types are types which represent a single file or medium, such as a single text or music file, or a single video. A multipart type represents a document that's comprised of multiple component parts, each of which may have its own individual MIME type; or, a multipart type may encapsulate multiple files being sent together in one transaction. For example, multipart MIME types are used when attaching multiple files to an email.</p> <h4 id="discrete_types">Discrete types</h4> <p>The discrete types currently registered with the IANA are:</p> <dl> <dt id="application"><a href="#application"><code>application</code></a></dt> <dd> <p>Any kind of binary data that doesn't fall explicitly into one of the other types; either data that will be executed or interpreted in some way or binary data that requires a specific application or category of application to use. Generic binary data (or binary data whose true type is unknown) is <code>application/octet-stream</code>. Other common examples include <code>application/pdf</code>, <code>application/pkcs8</code>, and <code>application/zip</code>. <a href="https://www.iana.org/assignments/media-types/media-types.xhtml#application" class="external" target="_blank">(See application type registry at IANA)</a></p> </dd> <dt id="audio"><a href="#audio"><code>audio</code></a></dt> <dd> <p>Audio or music data. Examples include <code>audio/mpeg</code>, <code>audio/vorbis</code>. <a href="https://www.iana.org/assignments/media-types/media-types.xhtml#audio" class="external" target="_blank">(See audio type registry at IANA)</a></p> </dd> <dt id="example"><a href="#example"><code>example</code></a></dt> <dd> <p>Reserved for use as a placeholder in examples showing how to use MIME types. These should never be used outside of sample code listings and documentation. <code>example</code> can also be used as a subtype; for instance, in an example related to working with audio on the web, the MIME type <code>audio/example</code> can be used to indicate that the type is a placeholder and should be replaced with an appropriate one when using the code in the real world.</p> </dd> <dt id="font"><a href="#font"><code>font</code></a></dt> <dd> <p>Font/typeface data. Common examples include <code>font/woff</code>, <code>font/ttf</code>, and <code>font/otf</code>. <a href="https://www.iana.org/assignments/media-types/media-types.xhtml#font" class="external" target="_blank">(See font type registry at IANA)</a></p> </dd> <dt id="image"><a href="#image"><code>image</code></a></dt> <dd> <p>Image or graphical data including both bitmap and vector still images as well as animated versions of still image formats such as animated <a href="/en-US/docs/Glossary/GIF">GIF</a> or APNG. Common examples are <code>image/jpeg</code>, <code>image/png</code>, and <code>image/svg+xml</code>. <a href="https://www.iana.org/assignments/media-types/media-types.xhtml#image" class="external" target="_blank">(See image type registry at IANA)</a></p> </dd> <dt id="model"><a href="#model"><code>model</code></a></dt> <dd> <p>Model data for a 3D object or scene. Examples include <code>model/3mf</code> and <code>model/vrml</code>. <a href="https://www.iana.org/assignments/media-types/media-types.xhtml#model" class="external" target="_blank">(See model type registry at IANA)</a></p> </dd> <dt id="text"><a href="#text"><code>text</code></a></dt> <dd> <p>Text-only data including any human-readable content, source code, or textual data such as comma-separated value (CSV) formatted data. Examples include: <code>text/plain</code>, <code>text/csv</code>, and <code>text/html</code>. <a href="https://www.iana.org/assignments/media-types/media-types.xhtml#text" class="external" target="_blank">(See text type registry at IANA)</a></p> </dd> <dt id="video"><a href="#video"><code>video</code></a></dt> <dd> <p>Video data or files, such as MP4 movies (<code>video/mp4</code>). <a href="https://www.iana.org/assignments/media-types/media-types.xhtml#video" class="external" target="_blank">(See video type registry at IANA)</a></p> </dd> </dl> <p>For text documents without a specific subtype, <code>text/plain</code> should be used. Similarly, for binary documents without a specific or known subtype, <code>application/octet-stream</code> should be used.</p> <h4 id="multipart_types">Multipart types</h4> <p><strong>Multipart</strong> types indicate a category of document broken into pieces, often with different MIME types; they can also be used — especially in email scenarios — to represent multiple, separate files which are all part of the same transaction. They represent a <strong>composite document</strong>.</p> <p>Except for <code>multipart/form-data</code>, used in the <a href="/en-US/docs/Web/HTTP/Methods/POST"><code>POST</code></a> method of <a href="/en-US/docs/Learn_web_development/Extensions/Forms">HTML Forms</a>, and <code>multipart/byteranges</code>, used with <a href="/en-US/docs/Web/HTTP/Status/206"><code>206</code></a> <code>Partial Content</code> to send part of a document, HTTP doesn't handle multipart documents in a special way: the message is transmitted to the browser (which will likely show a "Save As" window if it doesn't know how to display the document).</p> <p>There are two multipart types:</p> <dl> <dt id="message"><a href="#message"><code>message</code></a></dt> <dd> <p>A message that encapsulates other messages. This can be used, for instance, to represent an email that includes a forwarded message as part of its data, or to allow sending very large messages in chunks as if it were multiple messages. Examples include <code>message/rfc822</code> (for forwarded or replied-to message quoting) and <code>message/partial</code> to allow breaking a large message into smaller ones automatically to be reassembled by the recipient. <a href="https://www.iana.org/assignments/media-types/media-types.xhtml#message" class="external" target="_blank">(See message type registry at IANA)</a></p> </dd> <dt id="multipart"><a href="#multipart"><code>multipart</code></a></dt> <dd> <p>Data that consists of multiple components which may individually have different MIME types. Examples include <code>multipart/form-data</code> (for data produced using the <a href="/en-US/docs/Web/API/FormData"><code>FormData</code></a> API) and <code>multipart/byteranges</code> (defined in <a href="https://datatracker.ietf.org/doc/html/rfc7233#section-5.4.1" class="external" target="_blank">RFC 7233, section 5.4.1</a> and used with <a href="/en-US/docs/Glossary/HTTP">HTTP</a>'s <a href="/en-US/docs/Web/HTTP/Status/206"><code>206</code></a> "Partial Content" response returned when the fetched data is only part of the content, such as is delivered using the <a href="/en-US/docs/Web/HTTP/Headers/Range"><code>Range</code></a> header). <a href="https://www.iana.org/assignments/media-types/media-types.xhtml#multipart" class="external" target="_blank">(See multipart type registry at IANA)</a></p> </dd> </dl></div></section><section aria-labelledby="important_mime_types_for_web_developers"><h2 id="important_mime_types_for_web_developers"><a href="#important_mime_types_for_web_developers">Important MIME types for Web developers</a></h2><div class="section-content"></div></section><section aria-labelledby="applicationoctet-stream"><h3 id="applicationoctet-stream"><a href="#applicationoctet-stream">application/octet-stream</a></h3><div class="section-content"><p>This is the default for binary files. As it means <em>unknown binary</em> file, browsers usually don't execute it, or even ask if it should be executed. They treat it as if the <a href="/en-US/docs/Web/HTTP/Headers/Content-Disposition"><code>Content-Disposition</code></a> header was set to <code>attachment</code>, and propose a "Save As" dialog.</p></div></section><section aria-labelledby="textplain"><h3 id="textplain"><a href="#textplain">text/plain</a></h3><div class="section-content"><p>This is the default for textual files. Even if it really means "unknown textual file," browsers assume they can display it.</p> <div class="notecard note"> <p><strong>Note:</strong> <code>text/plain</code> does not mean "any kind of textual data." If they expect a specific kind of textual data, they will likely not consider it a match. Specifically if they download a <code>text/plain</code> file from a <a href="/en-US/docs/Web/HTML/Element/link"><code><link></code></a> element declaring a CSS file, they will not recognize it as a valid CSS file if presented with <code>text/plain</code>. The CSS mime type <code>text/css</code> must be used.</p> </div></div></section><section aria-labelledby="textcss"><h3 id="textcss"><a href="#textcss">text/css</a></h3><div class="section-content"><p>CSS files used to style a Web page <strong>must</strong> be sent with <code>text/css</code>. If a server doesn't recognize the <code>.css</code> suffix for CSS files, it may send them with <code>text/plain</code> or <code>application/octet-stream</code> MIME types. If so, they won't be recognized as CSS by most browsers and will be ignored.</p></div></section><section aria-labelledby="texthtml"><h3 id="texthtml"><a href="#texthtml">text/html</a></h3><div class="section-content"><p>All HTML content should be served with this type. Alternative MIME types for XHTML (like <code>application/xhtml+xml</code>) are mostly useless nowadays.</p> <div class="notecard note"> <p><strong>Note:</strong> Use <code>application/xml</code> or <code>application/xhtml+xml</code> if you want XML's strict parsing rules, <a href="/en-US/docs/Web/API/CDATASection"><code><![CDATA[…]]></code></a> sections, or elements that aren't from HTML/SVG/MathML namespaces.</p> </div></div></section><section aria-labelledby="textjavascript"><h3 id="textjavascript"><a href="#textjavascript">text/javascript</a></h3><div class="section-content"><p>Per the <a href="https://www.iana.org/assignments/media-types/media-types.xhtml#text" class="external" target="_blank">IANA Media Types registry</a>, <a href="https://www.rfc-editor.org/rfc/rfc9239.html" class="external" target="_blank">RFC 9239</a>, and the <a href="https://html.spec.whatwg.org/multipage/scripting.html#scriptingLanguages:text/javascript" class="external" target="_blank">HTML specification</a>, JavaScript content should always be served using the MIME type <code>text/javascript</code>. No other MIME types are considered valid for JavaScript, and using any MIME type other than <code>text/javascript</code> may result in scripts that do not load or run.</p> <p>You may find some JavaScript content incorrectly served with a <code>charset</code> parameter as part of the MIME type — as an attempt to specify the character set for the script content. That <code>charset</code> parameter isn't valid for JavaScript content, and in most cases will result in a script failing to load.</p> <h4 id="legacy_javascript_mime_types">Legacy JavaScript MIME types</h4> <p>In addition to the <code>text/javascript</code> MIME type, for historical reasons, the <a href="https://mimesniff.spec.whatwg.org/" class="external" target="_blank">MIME Sniffing Standard</a> (the definition of how browsers should interpret MIME types and figure out what to do with content that doesn't have a valid one) also allows JavaScript to be served using any of the following legacy JavaScript MIME types:</p> <ul> <li><code>application/javascript</code> <abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li> <li><code>application/ecmascript</code> <abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li> <li><code>application/x-ecmascript</code> <abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li> <li><code>application/x-javascript</code> <abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li> <li><code>text/ecmascript</code> <abbr class="icon icon-deprecated" title="Deprecated. Not for use in new websites."> <span class="visually-hidden">Deprecated</span> </abbr></li> <li><code>text/javascript1.0</code> <abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li> <li><code>text/javascript1.1</code> <abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li> <li><code>text/javascript1.2</code> <abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li> <li><code>text/javascript1.3</code> <abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li> <li><code>text/javascript1.4</code> <abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li> <li><code>text/javascript1.5</code> <abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li> <li><code>text/jscript</code> <abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li> <li><code>text/livescript</code> <abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li> <li><code>text/x-ecmascript</code> <abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li> <li><code>text/x-javascript</code> <abbr class="icon icon-nonstandard" title="Non-standard. Check cross-browser support before using."> <span class="visually-hidden">Non-standard</span> </abbr></li> </ul> <div class="notecard note"> <p><strong>Note:</strong> Even though any given <a href="/en-US/docs/Glossary/User_agent">user agent</a> may support any or all of these, you should only use <code>text/javascript</code>. It's the only MIME type guaranteed to work now and into the future.</p> </div></div></section><section aria-labelledby="image_types"><h3 id="image_types"><a href="#image_types">Image types</a></h3><div class="section-content"><p>Files whose MIME type is <code>image</code> contain image data. The subtype specifies which specific image file format the data represents.</p> <p>The following image types are used commonly enough to be considered <em>safe</em> for use on web pages:</p> <ul> <li><a href="/en-US/docs/Web/Media/Guides/Formats/Image_types#apng_animated_portable_network_graphics"><code>image/apng</code></a>: Animated Portable Network Graphics (APNG)</li> <li><a href="/en-US/docs/Web/Media/Guides/Formats/Image_types#avif_image"><code>image/avif</code></a> : AV1 Image File Format (AVIF)</li> <li><a href="/en-US/docs/Web/Media/Guides/Formats/Image_types#gif_graphics_interchange_format"><code>image/gif</code></a>: Graphics Interchange Format (GIF)</li> <li><a href="/en-US/docs/Web/Media/Guides/Formats/Image_types#jpeg_joint_photographic_experts_group_image"><code>image/jpeg</code></a>: Joint Photographic Expert Group image (JPEG)</li> <li><a href="/en-US/docs/Web/Media/Guides/Formats/Image_types#png_portable_network_graphics"><code>image/png</code></a>: Portable Network Graphics (PNG)</li> <li><a href="/en-US/docs/Web/Media/Guides/Formats/Image_types#svg_scalable_vector_graphics"><code>image/svg+xml</code></a>: Scalable Vector Graphics (SVG)</li> <li><a href="/en-US/docs/Web/Media/Guides/Formats/Image_types#webp_image"><code>image/webp</code></a>: Web Picture format (WEBP)</li> </ul> <p>The <a href="/en-US/docs/Web/Media/Guides/Formats/Image_types#common_image_file_types">Image file type and format guide</a> provides information and recommendations about when to use the different image formats.</p></div></section><section aria-labelledby="audio_and_video_types"><h3 id="audio_and_video_types"><a href="#audio_and_video_types">Audio and video types</a></h3><div class="section-content"><p>As is the case for images, HTML doesn't mandate that web browsers support any specific file and codec types for the <a href="/en-US/docs/Web/HTML/Element/audio"><code><audio></code></a> and <a href="/en-US/docs/Web/HTML/Element/video"><code><video></code></a> elements, so it's important to consider your target audience and the range of browsers (and versions of those browsers) they may be using when choosing the file type and codecs to use for media.</p> <p>Our <a href="/en-US/docs/Web/Media/Guides/Formats/Containers">media container formats guide</a> provides a list of the file types that are commonly supported by web browsers, including information about what their special use cases may be, any drawbacks they have, and compatibility information, along with other details.</p> <p>The <a href="/en-US/docs/Web/Media/Guides/Formats/Audio_codecs">audio codec</a> and <a href="/en-US/docs/Web/Media/Guides/Formats/Video_codecs">video codec</a> guides list the various codecs that web browsers often support, providing compatibility details along with technical information such as how many audio channels they support, what sort of compression is used, and what bit rates and so forth they're useful at. The <a href="/en-US/docs/Web/Media/Guides/Formats/WebRTC_codecs">codecs used by WebRTC</a> guide expands upon this by specifically covering the codecs supported by the major web browsers, so you can choose the codecs that best cover the range of browsers you wish to support.</p> <p>As for MIME types of audio or video files, they typically specify the container format (file type). The optional <a href="/en-US/docs/Web/Media/Guides/Formats/codecs_parameter">codecs parameter</a> can be added to the MIME type to further specify which codecs to use and what options were used to encode the media, such as codec profile, level, or other such information.</p> <p>For more information on common media types, see the <a href="/en-US/docs/Web/HTTP/MIME_types/Common_types">Common MIME types</a> page.</p></div></section><section aria-labelledby="multipartform-data"><h3 id="multipartform-data"><a href="#multipartform-data">multipart/form-data</a></h3><div class="section-content"><p>The <code>multipart/form-data</code> type can be used when sending the values of a completed <a href="/en-US/docs/Learn_web_development/Extensions/Forms">HTML Form</a> from browser to server.</p> <p>As a multipart document format, it consists of different parts, delimited by a boundary (a string starting with a double dash <code>--</code>). Each part is its own entity with its own HTTP headers, <a href="/en-US/docs/Web/HTTP/Headers/Content-Disposition"><code>Content-Disposition</code></a>, and <a href="/en-US/docs/Web/HTTP/Headers/Content-Type"><code>Content-Type</code></a> for file uploading fields.</p> <div class="code-example"><div class="example-header"><span class="language-name">http</span></div><pre class="brush: http notranslate"><code>Content-Type: multipart/form-data; boundary=aBoundaryString (other headers associated with the multipart document as a whole) --aBoundaryString Content-Disposition: form-data; name="myFile"; filename="img.jpg" Content-Type: image/jpeg (data) --aBoundaryString Content-Disposition: form-data; name="myField" (data) --aBoundaryString (more subparts) --aBoundaryString-- </code></pre></div> <p>The following <code><form></code>:</p> <div class="code-example"><div class="example-header"><span class="language-name">html</span></div><pre class="brush: html notranslate"><code><form action="http://localhost:8000/" method="post" enctype="multipart/form-data"> <label>Name: <input name="myTextField" value="Test" /></label> <label><input type="checkbox" name="myCheckBox" /> Check</label> <label> Upload file: <input type="file" name="myFile" value="test.txt" /> </label> <button>Send the file</button> </form> </code></pre></div> <p>will send this message:</p> <div class="code-example"><div class="example-header"><span class="language-name">http</span></div><pre class="brush: http notranslate"><code>POST / HTTP/1.1 Host: localhost:8000 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:50.0) Gecko/20100101 Firefox/50.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Connection: keep-alive Upgrade-Insecure-Requests: 1 Content-Type: multipart/form-data; boundary=---------------------------8721656041911415653955004498 Content-Length: 465 -----------------------------8721656041911415653955004498 Content-Disposition: form-data; name="myTextField" Test -----------------------------8721656041911415653955004498 Content-Disposition: form-data; name="myCheckBox" on -----------------------------8721656041911415653955004498 Content-Disposition: form-data; name="myFile"; filename="test.txt" Content-Type: text/plain Simple file. -----------------------------8721656041911415653955004498-- </code></pre></div></div></section><section aria-labelledby="multipartbyteranges"><h3 id="multipartbyteranges"><a href="#multipartbyteranges">multipart/byteranges</a></h3><div class="section-content"><p>The <code>multipart/byteranges</code> MIME type is used to send partial responses to the browser.</p> <p>When the <a href="/en-US/docs/Web/HTTP/Status/206"><code>206 Partial Content</code></a> status code is sent, this MIME type indicates that the document is composed of several parts, one for each of the requested ranges. Like other multipart types, the <a href="/en-US/docs/Web/HTTP/Headers/Content-Type"><code>Content-Type</code></a> uses a <code>boundary</code> to separate the pieces. Each piece has a <a href="/en-US/docs/Web/HTTP/Headers/Content-Type"><code>Content-Type</code></a> header with its actual type and a <a href="/en-US/docs/Web/HTTP/Headers/Content-Range"><code>Content-Range</code></a> of the range it represents.</p> <div class="code-example"><div class="example-header"><span class="language-name">http</span></div><pre class="brush: http notranslate"><code>HTTP/1.1 206 Partial Content Accept-Ranges: bytes Content-Type: multipart/byteranges; boundary=3d6b6a416f9b5 Content-Length: 385 --3d6b6a416f9b5 Content-Type: text/html Content-Range: bytes 100-200/1270 eta http-equiv="Content-type" content="text/html; charset=utf-8" /> <meta name="viewport" content --3d6b6a416f9b5 Content-Type: text/html Content-Range: bytes 300-400/1270 -color: #f0f0f2; margin: 0; padding: 0; font-family: "Open Sans", "Helvetica --3d6b6a416f9b5-- </code></pre></div></div></section><section aria-labelledby="importance_of_setting_the_correct_mime_type"><h2 id="importance_of_setting_the_correct_mime_type"><a href="#importance_of_setting_the_correct_mime_type">Importance of setting the correct MIME type</a></h2><div class="section-content"><p>Some server configurations may use the associated MIME type to perform optimizations, such as file concatenation, compression, or caching. See <a href="https://github.com/h5bp/server-configs-apache/blob/main/h5bp/web_performance/compression.conf" class="external" target="_blank">h5bp/server-configs-apache</a> for an example of an Apache configuration that compresses files of certain MIME types.</p> <p>Most web servers send unrecognized resources as the <code>application/octet-stream</code> MIME type. For security reasons, most browsers do not allow setting a custom default action (like "Open in Word") for such resources, forcing the user to save it to disk to use it.</p> <p>Some common incorrect server configurations:</p> <ul> <li>RAR-compressed files. In this case, the ideal would be the true type of the original files; this is often impossible as .RAR files can hold several resources of different types. In this case, configure the server to send <code>application/x-rar-compressed</code>.</li> <li>Audio and video. Only resources with the correct MIME Type will be played in <a href="/en-US/docs/Web/HTML/Element/video"><code><video></code></a> or <a href="/en-US/docs/Web/HTML/Element/audio"><code><audio></code></a> elements. Be sure to specify the correct <a href="/en-US/docs/Web/Media/Guides/Formats">media type for audio and video</a>.</li> <li>Proprietary file types. A specific type like <code>application/vnd.mspowerpoint</code> lets users open such files automatically in the presentation software of their choice.</li> </ul></div></section><section aria-labelledby="mime_sniffing"><h2 id="mime_sniffing"><a href="#mime_sniffing">MIME sniffing</a></h2><div class="section-content"><p>In the absence of a MIME type, or in certain cases where browsers believe they are incorrect, browsers may perform <em>MIME sniffing</em> — guessing the correct MIME type by looking at the bytes of the resource.</p> <p>Each browser performs MIME sniffing differently and under different circumstances. (For example, Safari will look at the file extension in the URL if the sent MIME type is unsuitable.) There are security concerns as some MIME types represent executable content. Servers can prevent MIME sniffing by sending the <a href="/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options"><code>X-Content-Type-Options</code></a> header.</p></div></section><section aria-labelledby="other_methods_of_conveying_document_type"><h2 id="other_methods_of_conveying_document_type"><a href="#other_methods_of_conveying_document_type">Other methods of conveying document type</a></h2><div class="section-content"><p>MIME types are not the only way to convey document type information:</p> <ul> <li>Filename suffixes are sometimes used, especially on Microsoft Windows. Not all operating systems consider these suffixes meaningful (such as Linux and macOS), and there is no guarantee they are correct.</li> <li>Magic numbers. The syntax of different formats allows file-type inference by looking at their byte structure. For example, GIF files start with the <code>47 49 46 38 39</code> hexadecimal value (<code>GIF89</code>), and PNG files with <code>89 50 4E 47</code> (<code>.PNG</code>). Not all file types have magic numbers, so this is not 100% reliable either.</li> </ul></div></section><section aria-labelledby="see_also"><h2 id="see_also"><a href="#see_also">See also</a></h2><div class="section-content"><ul> <li><a href="/en-US/docs/Web/Media">Web media technologies</a></li> <li><a href="/en-US/docs/Web/Media/Guides/Formats">Guide to media types used on the web</a></li> <li><a href="/en-US/docs/Learn_web_development/Extensions/Server-side/Configuring_server_MIME_types">Properly configuring server MIME types</a></li> </ul></div></section></article><aside class="article-footer"><div class="article-footer-inner"><div class="svg-container"><svg xmlns="http://www.w3.org/2000/svg" width="162" height="162" viewBox="0 0 162 162" fill="none" role="none"><mask id="b" fill="#fff"><path d="M97.203 47.04c8.113-7.886 18.004-13.871 28.906-17.492a78 78 0 0 1 33.969-3.39c11.443 1.39 22.401 5.295 32.024 11.411s17.656 14.28 23.476 23.86c5.819 9.579 9.269 20.318 10.083 31.385a69.85 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Content available under <a href="/en-US/docs/MDN/Writing_guidelines/Attrib_copyright_license">a Creative Commons license</a>.</p></div></div></footer></div><script type="application/json" id="hydration">{"url":"/en-US/docs/Web/HTTP/MIME_types","doc":{"body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p>A <strong>media type</strong> (also known as a <strong>Multipurpose Internet Mail Extensions or MIME type</strong>) indicates the nature and format of a document, file, or assortment of bytes.\nMIME types are defined and standardized in IETF's <a href=\"https://datatracker.ietf.org/doc/html/rfc6838\" class=\"external\" target=\"_blank\">RFC 6838</a>.</p>\n<p>The <a href=\"https://www.iana.org/\" class=\"external\" target=\"_blank\">Internet Assigned Numbers Authority (IANA)</a> is responsible for all official MIME types, and you can find the most up-to-date and complete list at their <a href=\"https://www.iana.org/assignments/media-types/media-types.xhtml\" class=\"external\" target=\"_blank\">Media Types</a> page.</p>\n<div class=\"notecard warning\">\n<p><strong>Warning:</strong>\nBrowsers use the MIME type, <em>not the file extension</em>, to determine how to process a URL,\nso it's important that web servers send the correct MIME type in the response's <a href=\"/en-US/docs/Web/HTTP/Headers/Content-Type\"><code>Content-Type</code></a> header.\nIf this is not correctly configured, browsers are likely to misinterpret the contents of files, sites will not work correctly, and downloaded files may be mishandled.</p>\n</div>"}},{"type":"prose","value":{"id":"structure_of_a_mime_type","title":"Structure of a MIME type","isH3":false,"content":"<p>A MIME type most commonly consists of just two parts: a <em>type</em> and a <em>subtype</em>, separated by a slash (<code>/</code>) — with no whitespace between:</p>\n<pre class=\"brush: plain notranslate\">type/subtype\n</pre>\n<p>The <strong><em>type</em></strong> represents the general category into which the data type falls, such as <code>video</code> or <code>text</code>.</p>\n<p>The <strong><em>subtype</em></strong> identifies the exact kind of data of the specified type the MIME type represents.\nFor example, for the MIME type <code>text</code>, the subtype might be <code>plain</code> (plain text), <code>html</code> (<a href=\"/en-US/docs/Glossary/HTML\">HTML</a> source code), or <code>calendar</code> (for iCalendar/<code>.ics</code>) files.</p>\n<p>Each type has its own set of possible subtypes. A MIME type always has both a type and a subtype, never just one or the other.</p>\n<p>An optional <strong>parameter</strong> can be added to provide additional details:</p>\n<pre class=\"brush: plain notranslate\">type/subtype;parameter=value\n</pre>\n<p>For example, for any MIME type whose main type is <code>text</code>, you can add the optional <code>charset</code> parameter to specify the character set used for the\ncharacters in the data.\nIf no <code>charset</code> is specified, the default is <a href=\"/en-US/docs/Glossary/ASCII\">ASCII</a> (<code>US-ASCII</code>) unless overridden by the <a href=\"/en-US/docs/Glossary/User_agent\">user agent's</a> settings.\nTo specify a UTF-8 text file, the MIME type <code>text/plain;charset=UTF-8</code> is used.</p>\n<p>MIME types are case-insensitive but are traditionally written in lowercase. The parameter values can be case-sensitive.</p>"}},{"type":"prose","value":{"id":"types","title":"Types","isH3":true,"content":"<p>There are two classes of type: <strong>discrete</strong> and <strong>multipart</strong>.\nDiscrete types are types which represent a single file or medium, such as a single text or music file, or a single video.\nA multipart type represents a document that's comprised of multiple component parts, each of which may have its own individual MIME type; or, a multipart type may encapsulate multiple files being sent together in one transaction.\nFor example, multipart MIME types are used when attaching multiple files to an email.</p>\n<h4 id=\"discrete_types\">Discrete types</h4>\n<p>The discrete types currently registered with the IANA are:</p>\n<dl>\n<dt id=\"application\"><a href=\"#application\"><code>application</code></a></dt>\n<dd>\n<p>Any kind of binary data that doesn't fall explicitly into one of the other types;\neither data that will be executed or interpreted in some way or binary data that requires a specific application or category of application to use.\nGeneric binary data (or binary data whose true type is unknown) is <code>application/octet-stream</code>.\nOther common examples include <code>application/pdf</code>, <code>application/pkcs8</code>, and <code>application/zip</code>.\n<a href=\"https://www.iana.org/assignments/media-types/media-types.xhtml#application\" class=\"external\" target=\"_blank\">(See application type registry at IANA)</a></p>\n</dd>\n<dt id=\"audio\"><a href=\"#audio\"><code>audio</code></a></dt>\n<dd>\n<p>Audio or music data. Examples include <code>audio/mpeg</code>,\n<code>audio/vorbis</code>.\n<a href=\"https://www.iana.org/assignments/media-types/media-types.xhtml#audio\" class=\"external\" target=\"_blank\">(See audio type registry at IANA)</a></p>\n</dd>\n<dt id=\"example\"><a href=\"#example\"><code>example</code></a></dt>\n<dd>\n<p>Reserved for use as a placeholder in examples showing how to use MIME types.\nThese should never be used outside of sample code listings and documentation.\n<code>example</code> can also be used as a subtype;\nfor instance, in an example related to working with audio on the web, the MIME type <code>audio/example</code> can be used to indicate that the type is a placeholder and should be replaced with an appropriate one when using the code in the real world.</p>\n</dd>\n<dt id=\"font\"><a href=\"#font\"><code>font</code></a></dt>\n<dd>\n<p>Font/typeface data. Common examples include <code>font/woff</code>, <code>font/ttf</code>, and <code>font/otf</code>.\n<a href=\"https://www.iana.org/assignments/media-types/media-types.xhtml#font\" class=\"external\" target=\"_blank\">(See font type registry at IANA)</a></p>\n</dd>\n<dt id=\"image\"><a href=\"#image\"><code>image</code></a></dt>\n<dd>\n<p>Image or graphical data including both bitmap and vector still images as well as\nanimated versions of still image formats such as animated <a href=\"/en-US/docs/Glossary/GIF\">GIF</a> or APNG.\nCommon examples are <code>image/jpeg</code>, <code>image/png</code>, and <code>image/svg+xml</code>.\n<a href=\"https://www.iana.org/assignments/media-types/media-types.xhtml#image\" class=\"external\" target=\"_blank\">(See image type registry at IANA)</a></p>\n</dd>\n<dt id=\"model\"><a href=\"#model\"><code>model</code></a></dt>\n<dd>\n<p>Model data for a 3D object or scene. Examples include <code>model/3mf</code> and <code>model/vrml</code>.\n<a href=\"https://www.iana.org/assignments/media-types/media-types.xhtml#model\" class=\"external\" target=\"_blank\">(See model type registry at IANA)</a></p>\n</dd>\n<dt id=\"text\"><a href=\"#text\"><code>text</code></a></dt>\n<dd>\n<p>Text-only data including any human-readable content, source code, or textual data such as comma-separated value (CSV) formatted data.\nExamples include: <code>text/plain</code>, <code>text/csv</code>, and <code>text/html</code>.\n<a href=\"https://www.iana.org/assignments/media-types/media-types.xhtml#text\" class=\"external\" target=\"_blank\">(See text type registry at IANA)</a></p>\n</dd>\n<dt id=\"video\"><a href=\"#video\"><code>video</code></a></dt>\n<dd>\n<p>Video data or files, such as MP4 movies (<code>video/mp4</code>).\n<a href=\"https://www.iana.org/assignments/media-types/media-types.xhtml#video\" class=\"external\" target=\"_blank\">(See video type registry at IANA)</a></p>\n</dd>\n</dl>\n<p>For text documents without a specific subtype, <code>text/plain</code> should be used.\nSimilarly, for binary documents without a specific or known subtype, <code>application/octet-stream</code> should be used.</p>\n<h4 id=\"multipart_types\">Multipart types</h4>\n<p><strong>Multipart</strong> types indicate a category of document broken into\npieces, often with different MIME types; they can also be used — especially in email\nscenarios — to represent multiple, separate files which are all part of the same\ntransaction. They represent a <strong>composite document</strong>.</p>\n<p>Except for <code>multipart/form-data</code>, used in the <a href=\"/en-US/docs/Web/HTTP/Methods/POST\"><code>POST</code></a> method of <a href=\"/en-US/docs/Learn_web_development/Extensions/Forms\">HTML Forms</a>, and <code>multipart/byteranges</code>, used with <a href=\"/en-US/docs/Web/HTTP/Status/206\"><code>206</code></a> <code>Partial Content</code> to send part of a document, HTTP doesn't handle multipart documents in a special way: the message is transmitted to the browser (which will likely\nshow a \"Save As\" window if it doesn't know how to display the document).</p>\n<p>There are two multipart types:</p>\n<dl>\n<dt id=\"message\"><a href=\"#message\"><code>message</code></a></dt>\n<dd>\n<p>A message that encapsulates other messages. This can be used, for instance, to represent an email that includes a forwarded message as part of its data,\nor to allow sending very large messages in chunks as if it were multiple messages.\nExamples include <code>message/rfc822</code> (for forwarded or replied-to message quoting) and <code>message/partial</code> to allow breaking a large message into smaller ones automatically to be reassembled by the recipient.\n<a href=\"https://www.iana.org/assignments/media-types/media-types.xhtml#message\" class=\"external\" target=\"_blank\">(See message type registry at IANA)</a></p>\n</dd>\n<dt id=\"multipart\"><a href=\"#multipart\"><code>multipart</code></a></dt>\n<dd>\n<p>Data that consists of multiple components which may individually have different MIME types.\nExamples include <code>multipart/form-data</code> (for data produced using the <a href=\"/en-US/docs/Web/API/FormData\"><code>FormData</code></a> API) and <code>multipart/byteranges</code> (defined in <a href=\"https://datatracker.ietf.org/doc/html/rfc7233#section-5.4.1\" class=\"external\" target=\"_blank\">RFC 7233, section 5.4.1</a> and used with <a href=\"/en-US/docs/Glossary/HTTP\">HTTP</a>'s <a href=\"/en-US/docs/Web/HTTP/Status/206\"><code>206</code></a>\n\"Partial Content\" response returned when the fetched data is only part of the content, such as is delivered using the <a href=\"/en-US/docs/Web/HTTP/Headers/Range\"><code>Range</code></a> header).\n<a href=\"https://www.iana.org/assignments/media-types/media-types.xhtml#multipart\" class=\"external\" target=\"_blank\">(See multipart type registry at IANA)</a></p>\n</dd>\n</dl>"}},{"type":"prose","value":{"id":"important_mime_types_for_web_developers","title":"Important MIME types for Web developers","isH3":false,"content":""}},{"type":"prose","value":{"id":"applicationoctet-stream","title":"application/octet-stream","isH3":true,"content":"<p>This is the default for binary files. As it means <em>unknown binary</em> file, browsers usually don't execute it, or even ask if it should be executed. They treat it as if the <a href=\"/en-US/docs/Web/HTTP/Headers/Content-Disposition\"><code>Content-Disposition</code></a> header was set to <code>attachment</code>, and propose a \"Save As\" dialog.</p>"}},{"type":"prose","value":{"id":"textplain","title":"text/plain","isH3":true,"content":"<p>This is the default for textual files. Even if it really means \"unknown textual file,\" browsers assume they can display it.</p>\n<div class=\"notecard note\">\n<p><strong>Note:</strong> <code>text/plain</code> does not mean \"any kind of textual data.\"\nIf they expect a specific kind of textual data, they will likely not consider it a match.\nSpecifically if they download a <code>text/plain</code> file from a <a href=\"/en-US/docs/Web/HTML/Element/link\"><code><link></code></a> element declaring a CSS file, they will not recognize it as a valid CSS file if presented with <code>text/plain</code>.\nThe CSS mime type <code>text/css</code> must be used.</p>\n</div>"}},{"type":"prose","value":{"id":"textcss","title":"text/css","isH3":true,"content":"<p>CSS files used to style a Web page <strong>must</strong> be sent with <code>text/css</code>.\nIf a server doesn't recognize the <code>.css</code> suffix for CSS files, it may send them with <code>text/plain</code> or <code>application/octet-stream</code> MIME types.\nIf so, they won't be recognized as CSS by most browsers and will be ignored.</p>"}},{"type":"prose","value":{"id":"texthtml","title":"text/html","isH3":true,"content":"<p>All HTML content should be served with this type. Alternative MIME types for XHTML (like <code>application/xhtml+xml</code>) are mostly useless nowadays.</p>\n<div class=\"notecard note\">\n<p><strong>Note:</strong>\nUse <code>application/xml</code> or <code>application/xhtml+xml</code> if you want XML's strict parsing rules, <a href=\"/en-US/docs/Web/API/CDATASection\"><code><![CDATA[…]]></code></a> sections, or elements that aren't from HTML/SVG/MathML namespaces.</p>\n</div>"}},{"type":"prose","value":{"id":"textjavascript","title":"text/javascript","isH3":true,"content":"<p>Per the <a href=\"https://www.iana.org/assignments/media-types/media-types.xhtml#text\" class=\"external\" target=\"_blank\">IANA Media Types registry</a>, <a href=\"https://www.rfc-editor.org/rfc/rfc9239.html\" class=\"external\" target=\"_blank\">RFC 9239</a>, and the <a href=\"https://html.spec.whatwg.org/multipage/scripting.html#scriptingLanguages:text/javascript\" class=\"external\" target=\"_blank\">HTML specification</a>, JavaScript content should always be served using the MIME type <code>text/javascript</code>.\nNo other MIME types are considered valid for JavaScript, and using any MIME type other than <code>text/javascript</code> may result in scripts that do not load or run.</p>\n<p>You may find some JavaScript content incorrectly served with a <code>charset</code> parameter as part of the MIME type — as an attempt to specify the character set for the script content.\nThat <code>charset</code> parameter isn't valid for JavaScript content, and in most cases will result in a script failing to load.</p>\n<h4 id=\"legacy_javascript_mime_types\">Legacy JavaScript MIME types</h4>\n<p>In addition to the <code>text/javascript</code> MIME type, for historical reasons, the <a href=\"https://mimesniff.spec.whatwg.org/\" class=\"external\" target=\"_blank\">MIME Sniffing Standard</a>\n(the definition of how browsers should interpret MIME types and figure\nout what to do with content that doesn't have a valid one) also allows JavaScript to be served using any of the following legacy JavaScript MIME types:</p>\n<ul>\n<li><code>application/javascript</code> <abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li>\n<li><code>application/ecmascript</code> <abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li>\n<li><code>application/x-ecmascript</code> <abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li>\n<li><code>application/x-javascript</code> <abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li>\n<li><code>text/ecmascript</code> <abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li>\n<li><code>text/javascript1.0</code> <abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li>\n<li><code>text/javascript1.1</code> <abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li>\n<li><code>text/javascript1.2</code> <abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li>\n<li><code>text/javascript1.3</code> <abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li>\n<li><code>text/javascript1.4</code> <abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li>\n<li><code>text/javascript1.5</code> <abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li>\n<li><code>text/jscript</code> <abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li>\n<li><code>text/livescript</code> <abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li>\n<li><code>text/x-ecmascript</code> <abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li>\n<li><code>text/x-javascript</code> <abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li>\n</ul>\n<div class=\"notecard note\">\n<p><strong>Note:</strong>\nEven though any given <a href=\"/en-US/docs/Glossary/User_agent\">user agent</a> may support any or all of these, you should only use <code>text/javascript</code>.\nIt's the only MIME type guaranteed to work now and into the future.</p>\n</div>"}},{"type":"prose","value":{"id":"image_types","title":"Image types","isH3":true,"content":"<p>Files whose MIME type is <code>image</code> contain image data.\nThe subtype specifies which specific image file format the data represents.</p>\n<p>The following image types are used commonly enough to be considered <em>safe</em> for use on web pages:</p>\n<ul>\n<li><a href=\"/en-US/docs/Web/Media/Guides/Formats/Image_types#apng_animated_portable_network_graphics\"><code>image/apng</code></a>: Animated Portable Network Graphics (APNG)</li>\n<li><a href=\"/en-US/docs/Web/Media/Guides/Formats/Image_types#avif_image\"><code>image/avif</code></a> : AV1 Image File Format (AVIF)</li>\n<li><a href=\"/en-US/docs/Web/Media/Guides/Formats/Image_types#gif_graphics_interchange_format\"><code>image/gif</code></a>: Graphics Interchange Format (GIF)</li>\n<li><a href=\"/en-US/docs/Web/Media/Guides/Formats/Image_types#jpeg_joint_photographic_experts_group_image\"><code>image/jpeg</code></a>: Joint Photographic Expert Group image (JPEG)</li>\n<li><a href=\"/en-US/docs/Web/Media/Guides/Formats/Image_types#png_portable_network_graphics\"><code>image/png</code></a>: Portable Network Graphics (PNG)</li>\n<li><a href=\"/en-US/docs/Web/Media/Guides/Formats/Image_types#svg_scalable_vector_graphics\"><code>image/svg+xml</code></a>: Scalable Vector Graphics (SVG)</li>\n<li><a href=\"/en-US/docs/Web/Media/Guides/Formats/Image_types#webp_image\"><code>image/webp</code></a>: Web Picture format (WEBP)</li>\n</ul>\n<p>The <a href=\"/en-US/docs/Web/Media/Guides/Formats/Image_types#common_image_file_types\">Image file type and format guide</a> provides information and recommendations about when to use the different image formats.</p>"}},{"type":"prose","value":{"id":"audio_and_video_types","title":"Audio and video types","isH3":true,"content":"<p>As is the case for images, HTML doesn't mandate that web browsers support any specific file and codec types for the <a href=\"/en-US/docs/Web/HTML/Element/audio\"><code><audio></code></a> and <a href=\"/en-US/docs/Web/HTML/Element/video\"><code><video></code></a> elements, so it's important to consider your target audience and the range of browsers (and versions of those browsers) they may be using when choosing the file type and codecs to use for media.</p>\n<p>Our <a href=\"/en-US/docs/Web/Media/Guides/Formats/Containers\">media container formats guide</a> provides a list of the file types that are commonly supported by web browsers,\nincluding information about what their special use cases may be, any drawbacks they have, and compatibility information, along with other details.</p>\n<p>The <a href=\"/en-US/docs/Web/Media/Guides/Formats/Audio_codecs\">audio codec</a> and <a href=\"/en-US/docs/Web/Media/Guides/Formats/Video_codecs\">video codec</a> guides list the various codecs that web browsers often support, providing compatibility details along with technical information such as how many audio channels they support, what sort of compression is used, and what bit rates and so forth they're useful at.\nThe <a href=\"/en-US/docs/Web/Media/Guides/Formats/WebRTC_codecs\">codecs used by WebRTC</a> guide expands upon this by specifically covering the codecs supported by the major web browsers, so you can choose the codecs that best cover the range of browsers you wish to support.</p>\n<p>As for MIME types of audio or video files, they typically specify the container format (file type).\nThe optional <a href=\"/en-US/docs/Web/Media/Guides/Formats/codecs_parameter\">codecs parameter</a> can be added to the MIME type to further specify which codecs to use and what options were used to encode the media, such as codec profile, level, or other such information.</p>\n<p>For more information on common media types, see the <a href=\"/en-US/docs/Web/HTTP/MIME_types/Common_types\">Common MIME types</a> page.</p>"}},{"type":"prose","value":{"id":"multipartform-data","title":"multipart/form-data","isH3":true,"content":"<p>The <code>multipart/form-data</code> type can be used when sending the values of a completed <a href=\"/en-US/docs/Learn_web_development/Extensions/Forms\">HTML Form</a> from browser to server.</p>\n<p>As a multipart document format, it consists of different parts, delimited by a boundary (a string starting with a double dash <code>--</code>).\nEach part is its own entity with its own HTTP headers, <a href=\"/en-US/docs/Web/HTTP/Headers/Content-Disposition\"><code>Content-Disposition</code></a>, and <a href=\"/en-US/docs/Web/HTTP/Headers/Content-Type\"><code>Content-Type</code></a> for file uploading fields.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">http</span></div><pre class=\"brush: http notranslate\"><code>Content-Type: multipart/form-data; boundary=aBoundaryString\n(other headers associated with the multipart document as a whole)\n\n--aBoundaryString\nContent-Disposition: form-data; name=\"myFile\"; filename=\"img.jpg\"\nContent-Type: image/jpeg\n\n(data)\n--aBoundaryString\nContent-Disposition: form-data; name=\"myField\"\n\n(data)\n--aBoundaryString\n(more subparts)\n--aBoundaryString--\n</code></pre></div>\n<p>The following <code><form></code>:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">html</span></div><pre class=\"brush: html notranslate\"><code><form\n action=\"http://localhost:8000/\"\n method=\"post\"\n enctype=\"multipart/form-data\">\n <label>Name: <input name=\"myTextField\" value=\"Test\" /></label>\n <label><input type=\"checkbox\" name=\"myCheckBox\" /> Check</label>\n <label>\n Upload file: <input type=\"file\" name=\"myFile\" value=\"test.txt\" />\n </label>\n <button>Send the file</button>\n</form>\n</code></pre></div>\n<p>will send this message:</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">http</span></div><pre class=\"brush: http notranslate\"><code>POST / HTTP/1.1\nHost: localhost:8000\nUser-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:50.0) Gecko/20100101 Firefox/50.0\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\nAccept-Language: en-US,en;q=0.5\nAccept-Encoding: gzip, deflate\nConnection: keep-alive\nUpgrade-Insecure-Requests: 1\nContent-Type: multipart/form-data; boundary=---------------------------8721656041911415653955004498\nContent-Length: 465\n\n-----------------------------8721656041911415653955004498\nContent-Disposition: form-data; name=\"myTextField\"\n\nTest\n-----------------------------8721656041911415653955004498\nContent-Disposition: form-data; name=\"myCheckBox\"\n\non\n-----------------------------8721656041911415653955004498\nContent-Disposition: form-data; name=\"myFile\"; filename=\"test.txt\"\nContent-Type: text/plain\n\nSimple file.\n-----------------------------8721656041911415653955004498--\n</code></pre></div>"}},{"type":"prose","value":{"id":"multipartbyteranges","title":"multipart/byteranges","isH3":true,"content":"<p>The <code>multipart/byteranges</code> MIME type is used to send partial responses to the browser.</p>\n<p>When the <a href=\"/en-US/docs/Web/HTTP/Status/206\"><code>206 Partial Content</code></a> status code is sent, this MIME type indicates that the document is composed of several parts, one for each of the\nrequested ranges. Like other multipart types, the <a href=\"/en-US/docs/Web/HTTP/Headers/Content-Type\"><code>Content-Type</code></a> uses a <code>boundary</code> to separate the pieces.\nEach piece has a <a href=\"/en-US/docs/Web/HTTP/Headers/Content-Type\"><code>Content-Type</code></a> header with its actual type and a <a href=\"/en-US/docs/Web/HTTP/Headers/Content-Range\"><code>Content-Range</code></a> of the range it represents.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">http</span></div><pre class=\"brush: http notranslate\"><code>HTTP/1.1 206 Partial Content\nAccept-Ranges: bytes\nContent-Type: multipart/byteranges; boundary=3d6b6a416f9b5\nContent-Length: 385\n\n--3d6b6a416f9b5\nContent-Type: text/html\nContent-Range: bytes 100-200/1270\n\neta http-equiv=\"Content-type\" content=\"text/html; charset=utf-8\" />\n <meta name=\"viewport\" content\n--3d6b6a416f9b5\nContent-Type: text/html\nContent-Range: bytes 300-400/1270\n\n-color: #f0f0f2;\n margin: 0;\n padding: 0;\n font-family: \"Open Sans\", \"Helvetica\n--3d6b6a416f9b5--\n</code></pre></div>"}},{"type":"prose","value":{"id":"importance_of_setting_the_correct_mime_type","title":"Importance of setting the correct MIME type","isH3":false,"content":"<p>Some server configurations may use the associated MIME type to perform optimizations, such as file concatenation, compression, or caching. See <a href=\"https://github.com/h5bp/server-configs-apache/blob/main/h5bp/web_performance/compression.conf\" class=\"external\" target=\"_blank\">h5bp/server-configs-apache</a> for an example of an Apache configuration that compresses files of certain MIME types.</p>\n<p>Most web servers send unrecognized resources as the <code>application/octet-stream</code> MIME type.\nFor security reasons, most browsers do not allow setting a custom default action (like \"Open in Word\") for such resources, forcing the user to save it to disk to use it.</p>\n<p>Some common incorrect server configurations:</p>\n<ul>\n<li>RAR-compressed files.\nIn this case, the ideal would be the true type of the original files; this is often impossible as .RAR files can hold several resources of different types.\nIn this case, configure the server to send <code>application/x-rar-compressed</code>.</li>\n<li>Audio and video.\nOnly resources with the correct MIME Type will be played in <a href=\"/en-US/docs/Web/HTML/Element/video\"><code><video></code></a> or <a href=\"/en-US/docs/Web/HTML/Element/audio\"><code><audio></code></a> elements.\nBe sure to specify the correct <a href=\"/en-US/docs/Web/Media/Guides/Formats\">media type for audio and video</a>.</li>\n<li>Proprietary file types.\nA specific type like <code>application/vnd.mspowerpoint</code> lets users open such files automatically in the presentation software of their choice.</li>\n</ul>"}},{"type":"prose","value":{"id":"mime_sniffing","title":"MIME sniffing","isH3":false,"content":"<p>In the absence of a MIME type, or in certain cases where browsers believe they are incorrect, browsers may perform <em>MIME sniffing</em> — guessing the correct MIME type by looking at the bytes of the resource.</p>\n<p>Each browser performs MIME sniffing differently and under different circumstances.\n(For example, Safari will look at the file extension in the URL if the sent MIME type is unsuitable.)\nThere are security concerns as some MIME types represent executable content.\nServers can prevent MIME sniffing by sending the <a href=\"/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options\"><code>X-Content-Type-Options</code></a> header.</p>"}},{"type":"prose","value":{"id":"other_methods_of_conveying_document_type","title":"Other methods of conveying document type","isH3":false,"content":"<p>MIME types are not the only way to convey document type information:</p>\n<ul>\n<li>Filename suffixes are sometimes used, especially on Microsoft Windows.\nNot all operating systems consider these suffixes meaningful (such as Linux and macOS), and there is no guarantee they are correct.</li>\n<li>Magic numbers. The syntax of different formats allows file-type inference by looking at their byte structure.\nFor example, GIF files start with the <code>47 49 46 38 39</code> hexadecimal value (<code>GIF89</code>), and PNG files with <code>89 50 4E 47</code> (<code>.PNG</code>).\nNot all file types have magic numbers, so this is not 100% reliable either.</li>\n</ul>"}},{"type":"prose","value":{"id":"see_also","title":"See also","isH3":false,"content":"<ul>\n<li><a href=\"/en-US/docs/Web/Media\">Web media technologies</a></li>\n<li><a href=\"/en-US/docs/Web/Media/Guides/Formats\">Guide to media types used on the web</a></li>\n<li><a href=\"/en-US/docs/Learn_web_development/Extensions/Server-side/Configuring_server_MIME_types\">Properly configuring server MIME types</a></li>\n</ul>"}}],"isActive":true,"isMarkdown":true,"isTranslated":false,"locale":"en-US","mdn_url":"/en-US/docs/Web/HTTP/MIME_types","modified":"2025-02-03T15:11:02.000Z","native":"English (US)","noIndexing":false,"other_translations":[{"locale":"de","title":"MIME-Typen (IANA-Medientypen)","native":"Deutsch"},{"locale":"es","title":"Tipos MIME","native":"Español"},{"locale":"fr","title":"Types MIME","native":"Français"},{"locale":"ja","title":"MIME タイプ（IANA メディア種別）","native":"日本語"},{"locale":"ko","title":"MIME 타입 (IANA 미디어 타입)","native":"한국어"},{"locale":"pt-BR","title":"MIME types","native":"Português (do Brasil)"},{"locale":"ru","title":"MIME types","native":"Русский"},{"locale":"zh-CN","title":"MIME 类型（IANA 媒体类型）","native":"中文 (简体)"}],"pageTitle":"MIME types (IANA media types) - HTTP | MDN","parents":[{"uri":"/en-US/docs/Web","title":"References"},{"uri":"/en-US/docs/Web/HTTP","title":"HTTP"},{"uri":"/en-US/docs/Web/HTTP/MIME_types","title":"MIME types (IANA media types)"}],"popularity":null,"short_title":"MIME types (IANA media types)","sidebarHTML":"<ol><li class=\"section\"><a href=\"/en-US/docs/Web/HTTP\">HTTP</a></li><li class=\"section\">Guides</li><li><a href=\"/en-US/docs/Web/HTTP/Overview\">An overview of HTTP</a></li><li><a href=\"/en-US/docs/Web/HTTP/Session\">A typical HTTP session</a></li><li><a href=\"/en-US/docs/Web/HTTP/Messages\">HTTP messages</a></li><li><em><a href=\"/en-US/docs/Web/HTTP/MIME_types\" aria-current=\"page\">MIME types (IANA media types)</a></em></li><li><a href=\"/en-US/docs/Web/HTTP/Compression\">Compression in HTTP</a></li><li><a href=\"/en-US/docs/Web/HTTP/Caching\">HTTP caching</a></li><li><a href=\"/en-US/docs/Web/HTTP/Authentication\">HTTP authentication</a></li><li><a href=\"/en-US/docs/Web/HTTP/Cookies\">Using HTTP cookies</a></li><li><a href=\"/en-US/docs/Web/HTTP/Redirections\">Redirections in HTTP</a></li><li><a href=\"/en-US/docs/Web/HTTP/Conditional_requests\">HTTP conditional requests</a></li><li><a href=\"/en-US/docs/Web/HTTP/Range_requests\">HTTP range requests</a></li><li><a href=\"/en-US/docs/Web/HTTP/Content_negotiation\">Content negotiation</a></li><li><a href=\"/en-US/docs/Web/HTTP/Connection_management_in_HTTP_1.x\">Connection management in HTTP/1.x</a></li><li><a href=\"/en-US/docs/Web/HTTP/Evolution_of_HTTP\">Evolution of HTTP</a></li><li><a href=\"/en-US/docs/Web/HTTP/Protocol_upgrade_mechanism\">Protocol upgrade mechanism</a></li><li><a href=\"/en-US/docs/Web/HTTP/Proxy_servers_and_tunneling\">Proxy servers and tunneling</a></li><li><a href=\"/en-US/docs/Web/HTTP/Client_hints\">HTTP Client hints</a></li><li class=\"toggle\"><details><summary>Security and privacy</summary><ol><li><a href=\"/en-US/docs/Web/Security/Practical_implementation_guides\">Practical security implementation guides</a></li><li><a href=\"/en-US/observatory\">HTTP Observatory</a></li><li><a href=\"/en-US/docs/Web/HTTP/Permissions_Policy\">Permissions Policy</a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/CSP\">Content Security Policy (CSP)</a></li><li><a href=\"/en-US/docs/Web/HTTP/CORS\">Cross-Origin Resource Sharing (CORS)</a></li><li><a href=\"/en-US/docs/Web/HTTP/Cross-Origin_Resource_Policy\">Cross-Origin Resource Policy (CORP)</a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers\">Headers</a></li></ol></details></li><li class=\"section\">References</li><li class=\"toggle\"><details><summary>HTTP headers</summary><ol><li><a href=\"/en-US/docs/Web/HTTP/Headers/Accept\"><code>Accept</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Accept-CH\"><code>Accept-CH</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Accept-Encoding\"><code>Accept-Encoding</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Accept-Language\"><code>Accept-Language</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Accept-Patch\"><code>Accept-Patch</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Accept-Post\"><code>Accept-Post</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Accept-Ranges\"><code>Accept-Ranges</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Credentials\"><code>Access-Control-Allow-Credentials</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Headers\"><code>Access-Control-Allow-Headers</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Methods\"><code>Access-Control-Allow-Methods</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Origin\"><code>Access-Control-Allow-Origin</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Access-Control-Expose-Headers\"><code>Access-Control-Expose-Headers</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Access-Control-Max-Age\"><code>Access-Control-Max-Age</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Access-Control-Request-Headers\"><code>Access-Control-Request-Headers</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Access-Control-Request-Method\"><code>Access-Control-Request-Method</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Age\"><code>Age</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Allow\"><code>Allow</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Alt-Svc\"><code>Alt-Svc</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Alt-Used\"><code>Alt-Used</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Attribution-Reporting-Eligible\"><code>Attribution-Reporting-Eligible</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Attribution-Reporting-Register-Source\"><code>Attribution-Reporting-Register-Source</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Attribution-Reporting-Register-Trigger\"><code>Attribution-Reporting-Register-Trigger</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Authorization\"><code>Authorization</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Cache-Control\"><code>Cache-Control</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Clear-Site-Data\"><code>Clear-Site-Data</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Connection\"><code>Connection</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Digest\"><code>Content-Digest</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Disposition\"><code>Content-Disposition</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-DPR\"><code>Content-DPR</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Encoding\"><code>Content-Encoding</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Language\"><code>Content-Language</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Length\"><code>Content-Length</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Location\"><code>Content-Location</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Range\"><code>Content-Range</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy\"><code>Content-Security-Policy</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only\"><code>Content-Security-Policy-Report-Only</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Type\"><code>Content-Type</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Cookie\"><code>Cookie</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Critical-CH\"><code>Critical-CH</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Cross-Origin-Embedder-Policy\"><code>Cross-Origin-Embedder-Policy</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Cross-Origin-Opener-Policy\"><code>Cross-Origin-Opener-Policy</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Cross-Origin-Resource-Policy\"><code>Cross-Origin-Resource-Policy</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Date\"><code>Date</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Device-Memory\"><code>Device-Memory</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/DNT\"><code>DNT</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Downlink\"><code>Downlink</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/DPR\"><code>DPR</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Early-Data\"><code>Early-Data</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/ECT\"><code>ECT</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/ETag\"><code>ETag</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Expect\"><code>Expect</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Expect-CT\"><code>Expect-CT</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Expires\"><code>Expires</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Forwarded\"><code>Forwarded</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/From\"><code>From</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Host\"><code>Host</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/If-Match\"><code>If-Match</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/If-Modified-Since\"><code>If-Modified-Since</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/If-None-Match\"><code>If-None-Match</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/If-Range\"><code>If-Range</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/If-Unmodified-Since\"><code>If-Unmodified-Since</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Keep-Alive\"><code>Keep-Alive</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Last-Modified\"><code>Last-Modified</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Link\"><code>Link</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Location\"><code>Location</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Max-Forwards\"><code>Max-Forwards</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/NEL\"><code>NEL</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/No-Vary-Search\"><code>No-Vary-Search</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Observe-Browsing-Topics\"><code>Observe-Browsing-Topics</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Origin\"><code>Origin</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Origin-Agent-Cluster\"><code>Origin-Agent-Cluster</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy\"><code>Permissions-Policy</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Pragma\"><code>Pragma</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Priority\"><code>Priority</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Proxy-Authenticate\"><code>Proxy-Authenticate</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Proxy-Authorization\"><code>Proxy-Authorization</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Range\"><code>Range</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Referer\"><code>Referer</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Referrer-Policy\"><code>Referrer-Policy</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Refresh\"><code>Refresh</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Report-To\"><code>Report-To</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Reporting-Endpoints\"><code>Reporting-Endpoints</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Repr-Digest\"><code>Repr-Digest</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Retry-After\"><code>Retry-After</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/RTT\"><code>RTT</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Save-Data\"><code>Save-Data</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-Browsing-Topics\"><code>Sec-Browsing-Topics</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Color-Scheme\"><code>Sec-CH-Prefers-Color-Scheme</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Motion\"><code>Sec-CH-Prefers-Reduced-Motion</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Transparency\"><code>Sec-CH-Prefers-Reduced-Transparency</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-CH-UA\"><code>Sec-CH-UA</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Arch\"><code>Sec-CH-UA-Arch</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Bitness\"><code>Sec-CH-UA-Bitness</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Form-Factors\"><code>Sec-CH-UA-Form-Factors</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Full-Version\"><code>Sec-CH-UA-Full-Version</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Full-Version-List\"><code>Sec-CH-UA-Full-Version-List</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Mobile\"><code>Sec-CH-UA-Mobile</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Model\"><code>Sec-CH-UA-Model</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Platform\"><code>Sec-CH-UA-Platform</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-Platform-Version\"><code>Sec-CH-UA-Platform-Version</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-CH-UA-WoW64\"><code>Sec-CH-UA-WoW64</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-Fetch-Dest\"><code>Sec-Fetch-Dest</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-Fetch-Mode\"><code>Sec-Fetch-Mode</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-Fetch-Site\"><code>Sec-Fetch-Site</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-Fetch-User\"><code>Sec-Fetch-User</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-GPC\"><code>Sec-GPC</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-Purpose\"><code>Sec-Purpose</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-WebSocket-Accept\"><code>Sec-WebSocket-Accept</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-WebSocket-Extensions\"><code>Sec-WebSocket-Extensions</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-WebSocket-Key\"><code>Sec-WebSocket-Key</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-WebSocket-Protocol\"><code>Sec-WebSocket-Protocol</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Sec-WebSocket-Version\"><code>Sec-WebSocket-Version</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Server\"><code>Server</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Server-Timing\"><code>Server-Timing</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Service-Worker\"><code>Service-Worker</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Service-Worker-Allowed\"><code>Service-Worker-Allowed</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Service-Worker-Navigation-Preload\"><code>Service-Worker-Navigation-Preload</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Set-Cookie\"><code>Set-Cookie</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Set-Login\"><code>Set-Login</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/SourceMap\"><code>SourceMap</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Speculation-Rules\"><code>Speculation-Rules</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security\"><code>Strict-Transport-Security</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Supports-Loading-Mode\"><code>Supports-Loading-Mode</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/TE\"><code>TE</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Timing-Allow-Origin\"><code>Timing-Allow-Origin</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Tk\"><code>Tk</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Trailer\"><code>Trailer</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Transfer-Encoding\"><code>Transfer-Encoding</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Upgrade\"><code>Upgrade</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Upgrade-Insecure-Requests\"><code>Upgrade-Insecure-Requests</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/User-Agent\"><code>User-Agent</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Vary\"><code>Vary</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Via\"><code>Via</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Viewport-Width\"><code>Viewport-Width</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Want-Content-Digest\"><code>Want-Content-Digest</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Want-Repr-Digest\"><code>Want-Repr-Digest</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Warning\"><code>Warning</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Width\"><code>Width</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/WWW-Authenticate\"><code>WWW-Authenticate</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options\"><code>X-Content-Type-Options</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control\"><code>X-DNS-Prefetch-Control</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/X-Forwarded-For\"><code>X-Forwarded-For</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/X-Forwarded-Host\"><code>X-Forwarded-Host</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/X-Forwarded-Proto\"><code>X-Forwarded-Proto</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/X-Frame-Options\"><code>X-Frame-Options</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/X-Permitted-Cross-Domain-Policies\"><code>X-Permitted-Cross-Domain-Policies</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/X-Powered-By\"><code>X-Powered-By</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/X-Robots-Tag\"><code>X-Robots-Tag</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/X-XSS-Protection\"><code>X-XSS-Protection</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li></ol></details></li><li class=\"toggle\"><details><summary>HTTP request methods</summary><ol><li><a href=\"/en-US/docs/Web/HTTP/Methods/CONNECT\"><code>CONNECT</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Methods/DELETE\"><code>DELETE</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Methods/GET\"><code>GET</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Methods/HEAD\"><code>HEAD</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Methods/OPTIONS\"><code>OPTIONS</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Methods/PATCH\"><code>PATCH</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Methods/POST\"><code>POST</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Methods/PUT\"><code>PUT</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Methods/TRACE\"><code>TRACE</code></a></li></ol></details></li><li class=\"toggle\"><details><summary>HTTP response status codes</summary><ol><li><a href=\"/en-US/docs/Web/HTTP/Status/100\"><code>100 Continue</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/101\"><code>101 Switching Protocols</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/102\"><code>102 Processing</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/103\"><code>103 Early Hints</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/200\"><code>200 OK</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/201\"><code>201 Created</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/202\"><code>202 Accepted</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/203\"><code>203 Non-Authoritative Information</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/204\"><code>204 No Content</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/205\"><code>205 Reset Content</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/206\"><code>206 Partial Content</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/207\"><code>207 Multi-Status</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/208\"><code>208 Already Reported</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/226\"><code>226 IM Used</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/300\"><code>300 Multiple Choices</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/301\"><code>301 Moved Permanently</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/302\"><code>302 Found</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/303\"><code>303 See Other</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/304\"><code>304 Not Modified</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/307\"><code>307 Temporary Redirect</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/308\"><code>308 Permanent Redirect</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/400\"><code>400 Bad Request</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/401\"><code>401 Unauthorized</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/402\"><code>402 Payment Required</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/403\"><code>403 Forbidden</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/404\"><code>404 Not Found</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/405\"><code>405 Method Not Allowed</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/406\"><code>406 Not Acceptable</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/407\"><code>407 Proxy Authentication Required</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/408\"><code>408 Request Timeout</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/409\"><code>409 Conflict</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/410\"><code>410 Gone</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/411\"><code>411 Length Required</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/412\"><code>412 Precondition Failed</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/413\"><code>413 Content Too Large</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/414\"><code>414 URI Too Long</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/415\"><code>415 Unsupported Media Type</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/416\"><code>416 Range Not Satisfiable</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/417\"><code>417 Expectation Failed</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/418\"><code>418 I'm a teapot</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/421\"><code>421 Misdirected Request</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/422\"><code>422 Unprocessable Content</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/423\"><code>423 Locked</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/424\"><code>424 Failed Dependency</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/425\"><code>425 Too Early</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/426\"><code>426 Upgrade Required</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/428\"><code>428 Precondition Required</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/429\"><code>429 Too Many Requests</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/431\"><code>431 Request Header Fields Too Large</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/451\"><code>451 Unavailable For Legal Reasons</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/500\"><code>500 Internal Server Error</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/501\"><code>501 Not Implemented</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/502\"><code>502 Bad Gateway</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/503\"><code>503 Service Unavailable</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/504\"><code>504 Gateway Timeout</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/505\"><code>505 HTTP Version Not Supported</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/506\"><code>506 Variant Also Negotiates</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/507\"><code>507 Insufficient Storage</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/508\"><code>508 Loop Detected</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/510\"><code>510 Not Extended</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Status/511\"><code>511 Network Authentication Required</code></a></li></ol></details></li><li class=\"toggle\"><details><summary>CSP directives</summary><ol><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/base-uri\"><code>CSP: base-uri</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/block-all-mixed-content\"><code>CSP: block-all-mixed-content</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/child-src\"><code>CSP: child-src</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/connect-src\"><code>CSP: connect-src</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/default-src\"><code>CSP: default-src</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/fenced-frame-src\"><code>CSP: fenced-frame-src</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/font-src\"><code>CSP: font-src</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/form-action\"><code>CSP: form-action</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/frame-ancestors\"><code>CSP: frame-ancestors</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/frame-src\"><code>CSP: frame-src</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/img-src\"><code>CSP: img-src</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/manifest-src\"><code>CSP: manifest-src</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/media-src\"><code>CSP: media-src</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/object-src\"><code>CSP: object-src</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/prefetch-src\"><code>CSP: prefetch-src</code></a><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/report-to\"><code>CSP: report-to</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/report-uri\"><code>CSP: report-uri</code></a><abbr class=\"icon icon-deprecated\" title=\"Deprecated. Not for use in new websites.\">\n<span class=\"visually-hidden\">Deprecated</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/require-trusted-types-for\"><code>CSP: require-trusted-types-for</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/sandbox\"><code>CSP: sandbox</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src\"><code>CSP: script-src</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src-attr\"><code>CSP: script-src-attr</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src-elem\"><code>CSP: script-src-elem</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style-src\"><code>CSP: style-src</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style-src-attr\"><code>CSP: style-src-attr</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style-src-elem\"><code>CSP: style-src-elem</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/trusted-types\"><code>CSP: trusted-types</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/upgrade-insecure-requests\"><code>CSP: upgrade-insecure-requests</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/worker-src\"><code>CSP: worker-src</code></a></li></ol></details></li><li class=\"toggle\"><details><summary>CORS errors</summary><ol><li><a href=\"/en-US/docs/Web/HTTP/CORS/Errors/CORSDisabled\"><code>Reason: CORS disabled</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/CORS/Errors/CORSAllowOriginNotMatchingOrigin\"><code>Reason: CORS header 'Access-Control-Allow-Origin' does not match 'xyz'</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/CORS/Errors/CORSMissingAllowOrigin\"><code>Reason: CORS header 'Access-Control-Allow-Origin' missing</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/CORS/Errors/CORSOriginHeaderNotAdded\"><code>Reason: CORS header 'Origin' cannot be added</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/CORS/Errors/CORSPreflightDidNotSucceed\"><code>Reason: CORS preflight channel did not succeed</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/CORS/Errors/CORSDidNotSucceed\"><code>Reason: CORS request did not succeed</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/CORS/Errors/CORSExternalRedirectNotAllowed\"><code>Reason: CORS request external redirect not allowed</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/CORS/Errors/CORSRequestNotHttp\"><code>Reason: CORS request not HTTP</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/CORS/Errors/CORSNotSupportingCredentials\"><code>Reason: Credential is not supported if the CORS header 'Access-Control-Allow-Origin' is '*'</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/CORS/Errors/CORSMethodNotFound\"><code>Reason: Did not find method in CORS header 'Access-Control-Allow-Methods'</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/CORS/Errors/CORSMIssingAllowCredentials\"><code>Reason: expected 'true' in CORS header 'Access-Control-Allow-Credentials'</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/CORS/Errors/CORSInvalidAllowHeader\"><code>Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Headers'</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/CORS/Errors/CORSInvalidAllowMethod\"><code>Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Methods'</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/CORS/Errors/CORSMissingAllowHeaderFromPreflight\"><code>Reason: missing token 'xyz' in CORS header 'Access-Control-Allow-Headers' from CORS preflight channel</code></a></li><li><a href=\"/en-US/docs/Web/HTTP/CORS/Errors/CORSMultipleAllowOriginNotAllowed\"><code>Reason: Multiple CORS header 'Access-Control-Allow-Origin' not allowed</code></a></li></ol></details></li><li class=\"toggle\"><details><summary>Permissions-Policy directives</summary><ol><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/accelerometer\"><code>Permissions-Policy: accelerometer</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/ambient-light-sensor\"><code>Permissions-Policy: ambient-light-sensor</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/attribution-reporting\"><code>Permissions-Policy: attribution-reporting</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/autoplay\"><code>Permissions-Policy: autoplay</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/bluetooth\"><code>Permissions-Policy: bluetooth</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/browsing-topics\"><code>Permissions-Policy: browsing-topics</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr><abbr class=\"icon icon-nonstandard\" title=\"Non-standard. Check cross-browser support before using.\">\n<span class=\"visually-hidden\">Non-standard</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/camera\"><code>Permissions-Policy: camera</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/compute-pressure\"><code>Permissions-Policy: compute-pressure</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/cross-origin-isolated\"><code>Permissions-Policy: cross-origin-isolated</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/display-capture\"><code>Permissions-Policy: display-capture</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/document-domain\"><code>Permissions-Policy: document-domain</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/encrypted-media\"><code>Permissions-Policy: encrypted-media</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/fullscreen\"><code>Permissions-Policy: fullscreen</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/gamepad\"><code>Permissions-Policy: gamepad</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/geolocation\"><code>Permissions-Policy: geolocation</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/gyroscope\"><code>Permissions-Policy: gyroscope</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/hid\"><code>Permissions-Policy: hid</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/identity-credentials-get\"><code>Permissions-Policy: identity-credentials-get</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/idle-detection\"><code>Permissions-Policy: idle-detection</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/local-fonts\"><code>Permissions-Policy: local-fonts</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/magnetometer\"><code>Permissions-Policy: magnetometer</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/microphone\"><code>Permissions-Policy: microphone</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/midi\"><code>Permissions-Policy: midi</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/otp-credentials\"><code>Permissions-Policy: otp-credentials</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/payment\"><code>Permissions-Policy: payment</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/picture-in-picture\"><code>Permissions-Policy: picture-in-picture</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/publickey-credentials-create\"><code>Permissions-Policy: publickey-credentials-create</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/publickey-credentials-get\"><code>Permissions-Policy: publickey-credentials-get</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/screen-wake-lock\"><code>Permissions-Policy: screen-wake-lock</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/serial\"><code>Permissions-Policy: serial</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/speaker-selection\"><code>Permissions-Policy: speaker-selection</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/storage-access\"><code>Permissions-Policy: storage-access</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/usb\"><code>Permissions-Policy: usb</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/web-share\"><code>Permissions-Policy: web-share</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/window-management\"><code>Permissions-Policy: window-management</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li><li><a href=\"/en-US/docs/Web/HTTP/Headers/Permissions-Policy/xr-spatial-tracking\"><code>Permissions-Policy: xr-spatial-tracking</code></a><abbr class=\"icon icon-experimental\" title=\"Experimental. Expect behavior to change in the future.\">\n<span class=\"visually-hidden\">Experimental</span>\n</abbr></li></ol></details></li><li><a href=\"/en-US/docs/Web/HTTP/Resources_and_specifications\">HTTP resources and specifications</a></li></ol>","source":{"folder":"en-us/web/http/mime_types","github_url":"https://github.com/mdn/content/blob/main/files/en-us/web/http/mime_types/index.md","last_commit_url":"https://github.com/mdn/content/commit/27bceead8e9b1fe9c92df0fa5e418f81bd5b9fdf","filename":"index.md"},"summary":"A media type (also known as a Multipurpose Internet Mail Extensions or MIME type) indicates the nature and format of a document, file, or assortment of bytes.\nMIME types are defined and standardized in IETF's RFC 6838.","title":"MIME types (IANA media types)","toc":[{"text":"Structure of a MIME type","id":"structure_of_a_mime_type"},{"text":"Important MIME types for Web developers","id":"important_mime_types_for_web_developers"},{"text":"Importance of setting the correct MIME type","id":"importance_of_setting_the_correct_mime_type"},{"text":"MIME sniffing","id":"mime_sniffing"},{"text":"Other methods of conveying document type","id":"other_methods_of_conveying_document_type"},{"text":"See also","id":"see_also"}],"pageType":"guide"}}</script></body></html>