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Brasil)</span></a></li></ul></div></div></li></ul></div></div></div></div><div class="container"><div class="notecard localized-content-note"><p><a href="/zh-CN/docs/MDN/Community/Contributing/Translated_content#活跃语言">此页面由社区从英文翻译而来。了解更多并加入 MDN Web Docs 社区。</a></p></div></div><div class="main-wrapper"><div class="sidebar-container"><aside id="sidebar-quicklinks" class="sidebar" data-macro="HTTPSidebar"><button type="button" class="button action backdrop" aria-label="Collapse sidebar"><span class="button-wrap"></span></button><nav aria-label="Related Topics" class="sidebar-inner"><header class="sidebar-actions"><section class="sidebar-filter-container"><div class="sidebar-filter "><label id="sidebar-filter-label" class="sidebar-filter-label" for="sidebar-filter-input"><span class="icon icon-filter"></span><span class="visually-hidden">Filter sidebar</span></label><input id="sidebar-filter-input" autoComplete="off" class="sidebar-filter-input-field false" type="text" placeholder="Filter" 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">在本文中</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#文件格式压缩">文件格式压缩</a></li><li class="document-toc-item "><a class="document-toc-link" href="#端到端压缩技术">端到端压缩技术</a></li><li class="document-toc-item "><a class="document-toc-link" href="#逐跳压缩技术">逐跳压缩技术</a></li></ul></section></div></div><div class="sidebar-body"> <ol> <li class="section"><a href="/zh-CN/docs/Web/HTTP">HTTP</a></li> <li class="section no-link">指南：</li> <li><a href="/zh-CN/docs/Web/HTTP/Overview">HTTP 概述</a></li> <li><a href="/zh-CN/docs/Web/HTTP/Session">典型的 HTTP 会话</a></li> <li><a href="/zh-CN/docs/Web/HTTP/Messages">HTTP 消息</a></li> <li><a href="/zh-CN/docs/Web/HTTP/MIME_types">MIME 类型（IANA 媒体类型）</a></li> <li><em><a href="/zh-CN/docs/Web/HTTP/Compression" aria-current="page">HTTP 协议中的数据压缩</a></em></li> <li><a href="/zh-CN/docs/Web/HTTP/Caching">HTTP 缓存</a></li> <li><a href="/zh-CN/docs/Web/HTTP/Authentication">HTTP 身份验证</a></li> <li><a href="/zh-CN/docs/Web/HTTP/Cookies">HTTP Cookie</a></li> <li><a href="/zh-CN/docs/Web/HTTP/Redirections">HTTP 的重定向</a></li> <li><a href="/zh-CN/docs/Web/HTTP/Conditional_requests">HTTP 条件请求</a></li> <li><a href="/zh-CN/docs/Web/HTTP/Range_requests">HTTP 范围请求</a></li> <li><a href="/zh-CN/docs/Web/HTTP/Content_negotiation">内容协商</a></li> <li><a href="/zh-CN/docs/Web/HTTP/Connection_management_in_HTTP_1.x">HTTP/1.x 的连接管理</a></li> <li><a href="/zh-CN/docs/Web/HTTP/Evolution_of_HTTP">HTTP 的发展</a></li> <li><a href="/zh-CN/docs/Web/HTTP/Protocol_upgrade_mechanism">协议升级机制</a></li> <li><a href="/zh-CN/docs/Web/HTTP/Proxy_servers_and_tunneling">Proxy servers and tunneling</a></li> <li><a href="/zh-CN/docs/Web/HTTP/Client_hints">HTTP 客户端提示（Clinet Hint）</a></li> <li class="toggle"> <details> <summary>HTTP 安全</summary> <ol> <li><a href="/zh-CN/docs/Web/Security/Practical_implementation_guides">确保你的站点安全</a></li> <li><a href="/en-US/observatory">HTTP Observatory</a></li> <li><a href="/zh-CN/docs/Web/HTTP/Permissions_Policy">权限策略</a></li> <li><a href="/zh-CN/docs/Web/HTTP/CSP">内容安全策略（CSP）</a></li> <li><a href="/zh-CN/docs/Web/HTTP/CORS">跨源资源共享（CORS）</a></li> <li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/HTTP/Cross-Origin_Resource_Policy">Cross-Origin Resource Policy (CORP)</a></li> <li><a href="/zh-CN/docs/Web/HTTP/Headers/Strict-Transport-Security">Strict-Transport-Security</a></li> </ol> </details> </li> <li class="section no-link">参考：</li> <li class="toggle"> <details> <summary>HTTP 标头</summary> <ol><li><a href="/zh-CN/docs/Web/HTTP/Headers/Accept"><code>Accept</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Accept-CH"><code>Accept-CH</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Accept-Encoding"><code>Accept-Encoding</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Accept-Language"><code>Accept-Language</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Accept-Patch"><code>Accept-Patch</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Accept-Post"><code>Accept-Post</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Accept-Ranges"><code>Accept-Ranges</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Access-Control-Allow-Credentials"><code>Access-Control-Allow-Credentials</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Access-Control-Allow-Headers"><code>Access-Control-Allow-Headers</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Access-Control-Allow-Methods"><code>Access-Control-Allow-Methods</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Access-Control-Allow-Origin"><code>Access-Control-Allow-Origin</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Access-Control-Expose-Headers"><code>Access-Control-Expose-Headers</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Access-Control-Max-Age"><code>Access-Control-Max-Age</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Access-Control-Request-Headers"><code>Access-Control-Request-Headers</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Access-Control-Request-Method"><code>Access-Control-Request-Method</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Age"><code>Age</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Allow"><code>Allow</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Alt-Svc"><code>Alt-Svc</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Alt-Used"><code>Alt-Used</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Attribution-Reporting-Eligible"><code>Attribution-Reporting-Eligible</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Attribution-Reporting-Register-Source"><code>Attribution-Reporting-Register-Source</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Attribution-Reporting-Register-Trigger"><code>Attribution-Reporting-Register-Trigger</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Authorization"><code>Authorization</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Cache-Control"><code>Cache-Control</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Clear-Site-Data"><code>Clear-Site-Data</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Connection"><code>Connection</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Digest"><code>Digest</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Disposition"><code>Content-Disposition</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-DPR"><code>Content-DPR</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Encoding"><code>Content-Encoding</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Language"><code>Content-Language</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Length"><code>Content-Length</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Location"><code>Content-Location</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Range"><code>Content-Range</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy"><code>Content-Security-Policy</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only"><code>Content-Security-Policy-Report-Only</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Type"><code>Content-Type</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Cookie"><code>Cookie</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Critical-CH"><code>Critical-CH</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Cross-Origin-Embedder-Policy"><code>Cross-Origin-Embedder-Policy</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Cross-Origin-Opener-Policy"><code>Cross-Origin-Opener-Policy</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Cross-Origin-Resource-Policy"><code>Cross-Origin-Resource-Policy</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Date"><code>Date</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Device-Memory"><code>Device-Memory</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/DNT"><code>DNT</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Downlink"><code>Downlink</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/DPR"><code>DPR</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Early-Data"><code>Early-Data</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/ECT"><code>ECT</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/ETag"><code>ETag</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Expect"><code>Expect</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Expect-CT"><code>Expect-CT</code></a><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Expires"><code>Expires</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Forwarded"><code>Forwarded</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/From"><code>From</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Host"><code>Host</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/If-Match"><code>If-Match</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/If-Modified-Since"><code>If-Modified-Since</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/If-None-Match"><code>If-None-Match</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/If-Range"><code>If-Range</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/If-Unmodified-Since"><code>If-Unmodified-Since</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Keep-Alive"><code>Keep-Alive</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Last-Modified"><code>Last-Modified</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Link"><code>Link</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Location"><code>Location</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Max-Forwards"><code>Max-Forwards</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/NEL"><code>NEL</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/No-Vary-Search"><code>No-Vary-Search</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Observe-Browsing-Topics"><code>Observe-Browsing-Topics</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Origin"><code>Origin</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Origin-Agent-Cluster"><code>Origin-Agent-Cluster</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy"><code>Permissions-Policy</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Pragma"><code>Pragma</code></a><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Priority"><code>Priority</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Proxy-Authenticate"><code>Proxy-Authenticate</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Proxy-Authorization"><code>Proxy-Authorization</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Range"><code>Range</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Referer"><code>Referer</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Referrer-Policy"><code>Referrer-Policy</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Refresh"><code>Refresh</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Report-To"><code>Report-To</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Reporting-Endpoints"><code>Reporting-Endpoints</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Repr-Digest"><code>Repr-Digest</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Retry-After"><code>Retry-After</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/RTT"><code>RTT</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Save-Data"><code>Save-Data</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-Browsing-Topics"><code>Sec-Browsing-Topics</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-CH-Prefers-Color-Scheme"><code>Sec-CH-Prefers-Color-Scheme</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Motion"><code>Sec-CH-Prefers-Reduced-Motion</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Transparency"><code>Sec-CH-Prefers-Reduced-Transparency</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA"><code>Sec-CH-UA</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA-Arch"><code>Sec-CH-UA-Arch</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA-Bitness"><code>Sec-CH-UA-Bitness</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA-Full-Version"><code>Sec-CH-UA-Full-Version</code></a><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/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="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA-Mobile"><code>Sec-CH-UA-Mobile</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA-Model"><code>Sec-CH-UA-Model</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA-Platform"><code>Sec-CH-UA-Platform</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA-Platform-Version"><code>Sec-CH-UA-Platform-Version</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-Fetch-Dest"><code>Sec-Fetch-Dest</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-Fetch-Mode"><code>Sec-Fetch-Mode</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-Fetch-Site"><code>Sec-Fetch-Site</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-Fetch-User"><code>Sec-Fetch-User</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-GPC"><code>Sec-GPC</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-Purpose"><code>Sec-Purpose</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-WebSocket-Accept"><code>Sec-WebSocket-Accept</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-WebSocket-Extensions"><code>Sec-WebSocket-Extensions</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-WebSocket-Key"><code>Sec-WebSocket-Key</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-WebSocket-Protocol"><code>Sec-WebSocket-Protocol</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Sec-WebSocket-Version"><code>Sec-WebSocket-Version</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Server"><code>Server</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Server-Timing"><code>Server-Timing</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Service-Worker-Navigation-Preload"><code>Service-Worker-Navigation-Preload</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Set-Cookie"><code>Set-Cookie</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Set-Login"><code>Set-Login</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/SourceMap"><code>SourceMap</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Speculation-Rules"><code>Speculation-Rules</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Strict-Transport-Security"><code>Strict-Transport-Security</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Supports-Loading-Mode"><code>Supports-Loading-Mode</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/TE"><code>TE</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Timing-Allow-Origin"><code>Timing-Allow-Origin</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Tk"><code>Tk</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Trailer"><code>Trailer</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Transfer-Encoding"><code>Transfer-Encoding</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Upgrade"><code>Upgrade</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Upgrade-Insecure-Requests"><code>Upgrade-Insecure-Requests</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/User-Agent"><code>User-Agent</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Vary"><code>Vary</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Via"><code>Via</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Viewport-Width"><code>Viewport-Width</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Want-Content-Digest"><code>Want-Content-Digest</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Want-Repr-Digest"><code>Want-Repr-Digest</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Warning"><code>Warning</code></a><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Width"><code>Width</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/WWW-Authenticate"><code>WWW-Authenticate</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/X-Content-Type-Options"><code>X-Content-Type-Options</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control"><code>X-DNS-Prefetch-Control</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/X-Forwarded-For"><code>X-Forwarded-For</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/X-Forwarded-Host"><code>X-Forwarded-Host</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/X-Forwarded-Proto"><code>X-Forwarded-Proto</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/X-Frame-Options"><code>X-Frame-Options</code></a><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/X-XSS-Protection"><code>X-XSS-Protection</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr></li></ol> </details> </li> <li class="toggle"> <details> <summary>HTTP 请求方法</summary> <ol><li><a href="/zh-CN/docs/Web/HTTP/Methods/CONNECT"><code>CONNECT</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Methods/DELETE"><code>DELETE</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Methods/GET"><code>GET</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Methods/HEAD"><code>HEAD</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Methods/OPTIONS"><code>OPTIONS</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Methods/PATCH"><code>PATCH</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Methods/POST"><code>POST</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Methods/PUT"><code>PUT</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Methods/TRACE"><code>TRACE</code></a></li></ol> </details> </li> <li class="toggle"> <details> <summary>HTTP 响应状态码</summary> <ol><li><a href="/zh-CN/docs/Web/HTTP/Status/100"><code>100 Continue</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/101"><code>101 Switching Protocol</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/102"><code>102 Processing</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/103"><code>103 Early Hints</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/200"><code>200 OK</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/201"><code>201 Created</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/202"><code>202 Accepted</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/203"><code>203 Non-Authoritative Information</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/204"><code>204 No Content</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/205"><code>205 Reset Content</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/206"><code>206 Partial Content</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/207"><code>207 Multi-Status</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/208"><code>208 Already Reported</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/226"><code>226 IM Used</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/300"><code>300 Multiple Choices</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/301"><code>301 Moved Permanently</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/302"><code>302 Found</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/303"><code>303 See Other</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/304"><code>304 Not Modified</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/307"><code>307 Temporary Redirect</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/308"><code>308 Permanent Redirect</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/400"><code>400 Bad Request</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/401"><code>401 Unauthorized</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/402"><code>402 Payment Required</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/403"><code>403 Forbidden</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/404"><code>404 Not Found</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/405"><code>405 Method Not Allowed</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/406"><code>406 Not Acceptable</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/407"><code>407 Proxy Authentication Required</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/408"><code>408 Request Timeout</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/409"><code>409 Conflict</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/410"><code>410 Gone</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/411"><code>411 Length Required</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/412"><code>412 Precondition Failed</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/413"><code>413 Content Too Large</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/414"><code>414 URI Too Long</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/415"><code>415 Unsupported Media Type</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/416"><code>416 Range Not Satisfiable</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/417"><code>417 Expectation Failed</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/418"><code>418 I'm a teapot</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/421"><code>421 Misdirected Request</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/422"><code>422 Unprocessable Entity</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/423"><code>423 Locked</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/424"><code>424 Failed Dependency</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/425"><code>425 Too Early</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/426"><code>426 Upgrade Required</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/428"><code>428 Precondition Required</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/429"><code>429 Too Many Requests</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/431"><code>431 Request Header Fields Too Large</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/451"><code>451 Unavailable For Legal Reasons</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/500"><code>500 Internal Server Error</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/501"><code>501 Not Implemented</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/502"><code>502 Bad Gateway</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/503"><code>503 Service Unavailable</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/504"><code>504 Gateway Timeout</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/505"><code>505 HTTP Version Not Supported</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/506"><code>506 Variant Also Negotiates</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/507"><code>507 Insufficient Storage</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/508"><code>508 Loop Detected</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/510"><code>510 Not Extended</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Status/511"><code>511 Network Authentication Required</code></a></li></ol> </details> </li> <li class="toggle"> <details> <summary>CSP 指令</summary> <ol><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/base-uri"><code>CSP: base-uri</code></a></li><li><a href="/zh-CN/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="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/child-src"><code>CSP: child-src</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/connect-src"><code>CSP: connect-src</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/default-src"><code>CSP：default-src</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/fenced-frame-src"><code>CSP: fenced-frame-src</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/font-src"><code>CSP: font-src</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/form-action"><code>CSP: form-action</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/frame-ancestors"><code>CSP：frame-ancestors</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/frame-src"><code>CSP: frame-src</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/img-src"><code>CSP: img-src</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/manifest-src"><code>CSP: manifest-src</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/media-src"><code>CSP: media-src</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/object-src"><code>CSP: object-src</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/prefetch-src"><code>CSP: prefetch-src</code></a><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/report-to"><code>report-to</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/report-uri"><code>CSP: report-uri</code></a><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/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="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/sandbox"><code>CSP: sandbox</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/script-src"><code>CSP: script-src</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/script-src-attr"><code>CSP: script-src-attr</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/script-src-elem"><code>CSP: script-src-elem</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/style-src"><code>CSP: style-src</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/style-src-attr"><code>CSP: style-src-attr</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/style-src-elem"><code>CSP: style-src-elem</code></a></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/trusted-types"><code>CSP: trusted-types</code></a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/upgrade-insecure-requests"><code>CSP: upgrade-insecure-requests</code></a></li><li><a href="/zh-CN/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 错误</summary> <ol><li><a href="/zh-CN/docs/Web/HTTP/CORS/Errors/CORSDisabled">原因：CORS disabled</a></li><li><a href="/zh-CN/docs/Web/HTTP/CORS/Errors/CORSAllowOriginNotMatchingOrigin">原因：CORS header 'Access-Control-Allow-Origin' does not match 'xyz'</a></li><li><a href="/zh-CN/docs/Web/HTTP/CORS/Errors/CORSMissingAllowOrigin">原因：CORS header 'Access-Control-Allow-Origin' missing</a></li><li><a href="/zh-CN/docs/Web/HTTP/CORS/Errors/CORSOriginHeaderNotAdded">原因：CORS header 'Origin' cannot be added</a></li><li><a href="/zh-CN/docs/Web/HTTP/CORS/Errors/CORSPreflightDidNotSucceed">原因：CORS preflight channel did not succeed</a></li><li><a href="/zh-CN/docs/Web/HTTP/CORS/Errors/CORSDidNotSucceed">原因：CORS request did not succeed</a></li><li><a href="/zh-CN/docs/Web/HTTP/CORS/Errors/CORSExternalRedirectNotAllowed">原因：CORS request external redirect not allowed</a></li><li><a href="/zh-CN/docs/Web/HTTP/CORS/Errors/CORSRequestNotHttp">原因：CORS request not HTTP</a></li><li><a href="/zh-CN/docs/Web/HTTP/CORS/Errors/CORSNotSupportingCredentials">原因：Credential is not supported if the CORS header 'Access-Control-Allow-Origin' is '*'</a></li><li><a href="/zh-CN/docs/Web/HTTP/CORS/Errors/CORSMethodNotFound">原因：Did not find method in CORS header 'Access-Control-Allow-Methods'</a></li><li><a href="/zh-CN/docs/Web/HTTP/CORS/Errors/CORSMIssingAllowCredentials">原因：expected 'true' in CORS header 'Access-Control-Allow-Credentials'</a></li><li><a href="/zh-CN/docs/Web/HTTP/CORS/Errors/CORSInvalidAllowHeader">原因：invalid token 'xyz' in CORS header 'Access-Control-Allow-Headers'</a></li><li><a href="/zh-CN/docs/Web/HTTP/CORS/Errors/CORSInvalidAllowMethod">原因：invalid token 'xyz' in CORS header 'Access-Control-Allow-Methods'</a></li><li><a href="/zh-CN/docs/Web/HTTP/CORS/Errors/CORSMissingAllowHeaderFromPreflight">原因：missing token 'xyz' in CORS header 'Access-Control-Allow-Headers' from CORS preflight channel</a></li><li><a href="/zh-CN/docs/Web/HTTP/CORS/Errors/CORSMultipleAllowOriginNotAllowed">原因：Multiple CORS header 'Access-Control-Allow-Origin' not allowed</a></li></ol> </details> </li> <li class="toggle"> <details> <summary>权限策略指令</summary> <ol><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/accelerometer">Permissions-Policy: accelerometer</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/ambient-light-sensor">Permissions-Policy: ambient-light-sensor</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/attribution-reporting">Permissions-Policy: attribution-reporting</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/autoplay">Permissions-Policy: autoplay</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/bluetooth">Permissions-Policy: bluetooth</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/browsing-topics">Permissions-Policy: browsing-topics</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr><abbr class="icon icon-nonstandard" title="非标准。请在使用前检查跨浏览器支持。"> <span class="visually-hidden">非标准</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/camera">Permissions-Policy: camera</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/compute-pressure">Permissions-Policy: compute-pressure</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/display-capture">Permissions-Policy: display-capture</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/document-domain">Permissions-Policy: document-domain</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/encrypted-media">Permissions-Policy: encrypted-media</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/fullscreen">Permissions-Policy: fullscreen</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/gamepad">Permissions-Policy: gamepad</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/geolocation">Permissions-Policy: geolocation</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/gyroscope">Permissions-Policy: gyroscope</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/hid">Permissions-Policy: hid</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/identity-credentials-get">Permissions-Policy: identity-credentials-get</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/idle-detection">Permissions-Policy: idle-detection</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/local-fonts">Permissions-Policy: local-fonts</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/magnetometer">Permissions-Policy: magnetometer</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/microphone">Permissions-Policy: microphone</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/midi">Permissions-Policy: midi</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/otp-credentials">Permissions-Policy: otp-credentials</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/payment">Permissions-Policy: payment</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/picture-in-picture">Permissions-Policy: picture-in-picture</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/publickey-credentials-create">Permissions-Policy: publickey-credentials-create</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/publickey-credentials-get">Permissions-Policy: publickey-credentials-get</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/screen-wake-lock">Permissions-Policy: screen-wake-lock</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/serial">Permissions-Policy: serial</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/speaker-selection">Permissions-Policy: speaker-selection</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/storage-access">Permissions-Policy: storage-access</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/usb">Permissions-Policy: usb</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/web-share">Permissions-Policy: web-share</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/window-management">Permissions-Policy: window-management</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li><li><a href="/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/xr-spatial-tracking">Permissions-Policy: xr-spatial-tracking</a><abbr class="icon icon-experimental" title="实验性。预期行为可能会在未来发生变更。"> <span class="visually-hidden">实验性</span> </abbr></li></ol> </details> </li> <li><a href="/zh-CN/docs/Web/HTTP/Resources_and_specifications">HTTP 资源与规范</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">在本文中</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#文件格式压缩">文件格式压缩</a></li><li class="document-toc-item "><a class="document-toc-link" href="#端到端压缩技术">端到端压缩技术</a></li><li class="document-toc-item "><a class="document-toc-link" href="#逐跳压缩技术">逐跳压缩技术</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="zh-CN"><header><h1>HTTP 协议中的数据压缩</h1></header><div class="section-content"><p><strong>数据压缩</strong>是提高 Web 站点性能的一种重要手段。对于有些文件来说，高达 70% 的压缩比率可以大大减低对于带宽的需求。随着时间的推移，压缩算法的效率也越来越高，同时也有新的压缩算法被发明出来，应用在客户端与服务器端。</p> <p>在实际应用时，web 开发者不需要亲手实现压缩机制，浏览器及服务器都已经将其实现了，不过他们需要确保在服务器端进行了合理的配置。数据压缩会在三个不同的层面发挥作用：</p> <ul> <li>首先某些格式的文件会采用特定的优化算法进行压缩，</li> <li>其次在 HTTP 协议层面会进行通用数据加密，即数据资源会以压缩的形式进行端到端传输，</li> <li>最后数据压缩还会发生在网络连接层面，即发生在 HTTP 连接的两个节点之间。</li> </ul></div><section aria-labelledby="文件格式压缩"><h2 id="文件格式压缩"><a href="#文件格式压缩">文件格式压缩</a></h2><div class="section-content"><p>每一种文件类型都会存有冗余，也就是<em>浪费的空间</em>。如果一个典型的文本文件存在 60% 的冗余的话，那么对于其他类型的文件，例如音频或视频文件来说，这个比率会更高。不同于文本文件，这些其他类型的媒体文件占据的空间也更大，所以很早就出现了回收这些浪费的空间的需求。工程师们设计了可以应用于特定用途的文件类型的经过优化的算法。用于文件的压缩算法可以大致分为两类：</p> <ul> <li><em>无损压缩</em>。在压缩与解压缩的循环期间，不会对要恢复的数据进行修改。复原后的数据与原始数据是一致的（比特与比特之间一一对应）。对于图片文件来说，<code>gif</code> 或者 <code>png</code> 格式的文件就是采用了无损压缩算法。</li> <li><em>有损压缩</em>。在压缩与解压缩的循环期间，会对原始数据进行修改，但是会（希望）以用户无法觉察的方式进行。网络上的视频文件通常采用有损压缩算法，<code>jpeg</code> 格式的图片也是有损压缩。</li> </ul> <p>一些特定的文件格式既可以采用无损压缩算法，又可以采用有损压缩算法，例如 <code>webp</code>，并且有损压缩算法可以对压缩比率进行配置，当然这会导致压缩品质的不同。为了使一个站点获得更好的性能，理想情况是在保持可以接受的品质水准的前提下，压缩比率尽可能得高。对于图片来说，通过压缩工具生成的图片对于 Web 应用来说，优化程度可能依然不够高。一般建议选用在保持所要求的品质的前提下压缩比率尽可能高的工具。这里有<a href="https://www.creativebloq.com/design/image-compression-tools-1132865" class="external" target="_blank">各种各样的工具</a>专门用来干这个。</p> <p>有损压缩通常会比无损压缩效率更高一些。</p> <div class="notecard note"> <p><strong>备注：</strong>由于数据压缩技术在一些特定类型的文件上效果很好，再次进行压缩通常没有什么效果。事实上，这种做法常常会适得其反，因为间接开销（该类型算法通常需要使用字典，而字典的大小是会计入初始大小的）会比在压缩过程中获取的额外收益要高，从而会使文件的体积增加。不要对压缩格式的文件应用如下两种压缩技术。</p> </div></div></section><section aria-labelledby="端到端压缩技术"><h2 id="端到端压缩技术"><a href="#端到端压缩技术">端到端压缩技术</a></h2><div class="section-content"><p>对于各种压缩手段来说，端到端压缩技术是 Web 站点性能提升最大的地方。端到端压缩技术指的是消息主体的压缩是在服务器端完成的，并且在传输过程中保持不变，直到抵达客户端。不管途中遇到什么样的中间节点，它们都会使消息主体保持原样。</p> <p> <img src="/zh-CN/docs/Web/HTTP/Compression/httpenco1.svg" alt="服务器通过网络节点向客户端发送一个压缩的 HTTP 主体。该主体直到到达客户端之前，不会在网络中的任何一跳之间进行解压缩。" width="950" height="463" loading="lazy"> </p> <p>所有的现代浏览器及服务器都支持该技术，唯一需要协商的是所采用的压缩算法。这些压缩算法是为文本内容进行过优化的。在上世纪 90 年代，压缩技术快速发展，为数众多的算法相继出现，扩大了可选的范围。如今只有两种算法有着举足轻重的地位：<code>gzip</code> 应用最广泛，<code>br</code> 则是新的挑战者。</p> <p>为了选择要采用的压缩算法，浏览器和服务器之间会使用<a href="/zh-CN/docs/Web/HTTP/Content_negotiation">主动协商机制</a>。浏览器发送 <a href="/zh-CN/docs/Web/HTTP/Headers/Accept-Encoding"><code>Accept-Encoding</code></a> 标头，其中包含有它所支持的压缩算法，以及各自的优先级，服务器则从中选择一种，使用该算法对响应的消息主体进行压缩，并且发送 <a href="/zh-CN/docs/Web/HTTP/Headers/Content-Encoding"><code>Content-Encoding</code></a> 标头来告知浏览器它选择了哪一种算法。由于该内容协商过程是基于编码类型来选择资源的展现形式的，在响应时，服务器至少发送一个包含 <a href="/zh-CN/docs/Web/HTTP/Headers/Accept-Encoding"><code>Accept-Encoding</code></a> 的 <a href="/zh-CN/docs/Web/HTTP/Headers/Vary"><code>Vary</code></a> 标头以及该标头；这样的话，缓存服务器就可以对资源的不同展现形式进行缓存。</p> <p> <img src="/zh-CN/docs/Web/HTTP/Compression/httpcompression1.svg" alt="客户端使用“Accept-Encoding:br, gzip”标头请求内容。服务器使用 Brotli 算法压缩的主体以及所需的“Content-Encoding”和“Vary”标头进行响应。" width="850" height="479" loading="lazy"> </p> <p>由于压缩技术可以带来很大的性能提升，建议对除了已经经过压缩的文件如图片、音频和视频文件之外的其他类型的文件均进行压缩。</p> <p>Apache 服务器支持数据压缩，有 <a href="https://httpd.apache.org/docs/current/mod/mod_deflate.html" class="external" target="_blank">mod_deflate</a>可供使用；nginx 中有<a href="http://nginx.org/en/docs/http/ngx_http_gzip_module.html" class="external" target="_blank">ngx_http_gzip_module</a> 模块；在 IIS 中则可以使用 <a href="https://www.iis.net/configreference/system.webserver/httpcompression" class="external" target="_blank"><code><httpCompression></code></a> 元素。</p></div></section><section aria-labelledby="逐跳压缩技术"><h2 id="逐跳压缩技术"><a href="#逐跳压缩技术">逐跳压缩技术</a></h2><div class="section-content"><p>逐跳压缩技术尽管与端到端压缩技术有些类似，但是它们在一点上有着本质的区别：即这里的压缩指的不是对源头服务器上的资源的压缩，以此来创建一份特定的展现形式然后进行传输，而是对客户端与服务器端之间的任意两个节点之间传递的消息的主体的压缩。在两个相邻的中间节点之间的连接上，可能会应用<em>不同</em>的压缩方式。</p> <p> <img src="/zh-CN/docs/Web/HTTP/Compression/httpte1.svg" alt="服务器通过网络节点向客户端发送一个未经压缩的 HTTP 主体。该主体在到达客户端之前，由网络上的节点根据“Transfer-Encoding”标头进行压缩和解压缩。" width="1132" height="624" loading="lazy"> </p> <p>为了实现这个目的，HTTP 协议中采用了与端到端压缩技术所使用的内容协商机制相类似的机制：节点发送请求，使用 <a href="/zh-CN/docs/Web/HTTP/Headers/TE"><code>TE</code></a> 标头来宣告它的意愿，另外一个节点则从中选择合适的方法，进行应用，然后在 <a href="/zh-CN/docs/Web/HTTP/Headers/Transfer-Encoding"><code>Transfer-Encoding</code></a> 标头中指出它所选择的方法。</p> <p> <img src="/zh-CN/docs/Web/HTTP/Compression/httpcomp2.svg" alt="客户端从没有压缩相关标头的服务器请求内容。服务器会使用未经压缩的主体进行响应。该主体在到达客户端之前，由网络上的节点进行压缩和解压缩。" width="951" height="943" loading="lazy"> </p> <p>在实际应用中，逐跳压缩对于服务器和客户端来说是不可见的，并且很少使用。<a href="/zh-CN/docs/Web/HTTP/Headers/TE"><code>TE</code></a> 标头和 <a href="/zh-CN/docs/Web/HTTP/Headers/Transfer-Encoding"><code>Transfer-Encoding</code></a> 标头最常用来发送分块响应，允许在获得资源的确切长度之前就可以开始传输。</p> <p>注意，在单次转发层面使用 <a href="/zh-CN/docs/Web/HTTP/Headers/Transfer-Encoding"><code>Transfer-Encoding</code></a> 标头和压缩技术是如此地少见，以至于 Apache、nginx 或 IIS 等服务器都不太容易配置。此类配置通常用在代理服务器层面。</p></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 69.85 0 0 1-5.387 32.44c-4.358 10.272-11.115 19.443-19.747 26.801-8.632 7.359-18.908 12.709-30.034 15.637l-6.17-21.698c7.666-2.017 14.746-5.703 20.694-10.773 5.948-5.071 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not-for-profit parent, the <a target="_blank" rel="noopener noreferrer" href="https://foundation.mozilla.org/">Mozilla Foundation</a>.<br/>Portions of this content are ©1998–2024 by individual mozilla.org contributors. Content available under <a href="/zh-CN/docs/MDN/Writing_guidelines/Attrib_copyright_license">a Creative Commons license</a>.</p></div></div></footer></div><script type="application/json" id="hydration">{"url":"/zh-CN/docs/Web/HTTP/Compression","doc":{"isMarkdown":true,"isTranslated":true,"isActive":true,"flaws":{},"title":"HTTP 协议中的数据压缩","mdn_url":"/zh-CN/docs/Web/HTTP/Compression","locale":"zh-CN","native":"中文 (简体)","sidebarHTML":"\n <ol>\n <li class=\"section\"><a href=\"/zh-CN/docs/Web/HTTP\">HTTP</a></li>\n <li class=\"section no-link\">指南：</li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Overview\">HTTP 概述</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Session\">典型的 HTTP 会话</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Messages\">HTTP 消息</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/MIME_types\">MIME 类型（IANA 媒体类型）</a></li>\n <li><em><a href=\"/zh-CN/docs/Web/HTTP/Compression\" aria-current=\"page\">HTTP 协议中的数据压缩</a></em></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Caching\">HTTP 缓存</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Authentication\">HTTP 身份验证</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Cookies\">HTTP Cookie</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Redirections\">HTTP 的重定向</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Conditional_requests\">HTTP 条件请求</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Range_requests\">HTTP 范围请求</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Content_negotiation\">内容协商</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Connection_management_in_HTTP_1.x\">HTTP/1.x 的连接管理</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Evolution_of_HTTP\">HTTP 的发展</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Protocol_upgrade_mechanism\">协议升级机制</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Proxy_servers_and_tunneling\">Proxy servers and tunneling</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Client_hints\">HTTP 客户端提示（Clinet Hint）</a></li>\n <li class=\"toggle\">\n <details>\n <summary>HTTP 安全</summary>\n <ol>\n <li><a href=\"/zh-CN/docs/Web/Security/Practical_implementation_guides\">确保你的站点安全</a></li>\n <li><a href=\"/en-US/observatory\">HTTP Observatory</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Permissions_Policy\">权限策略</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/CSP\">内容安全策略（CSP）</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/CORS\">跨源资源共享（CORS）</a></li>\n <li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/HTTP/Cross-Origin_Resource_Policy\">Cross-Origin Resource Policy (CORP)</a></li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Strict-Transport-Security\">Strict-Transport-Security</a></li>\n </ol>\n </details>\n </li>\n <li class=\"section no-link\">参考：</li>\n <li class=\"toggle\">\n <details>\n <summary>HTTP 标头</summary>\n <ol><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Accept\"><code>Accept</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Accept-CH\"><code>Accept-CH</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Accept-Encoding\"><code>Accept-Encoding</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Accept-Language\"><code>Accept-Language</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Accept-Patch\"><code>Accept-Patch</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Accept-Post\"><code>Accept-Post</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Accept-Ranges\"><code>Accept-Ranges</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Access-Control-Allow-Credentials\"><code>Access-Control-Allow-Credentials</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Access-Control-Allow-Headers\"><code>Access-Control-Allow-Headers</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Access-Control-Allow-Methods\"><code>Access-Control-Allow-Methods</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Access-Control-Allow-Origin\"><code>Access-Control-Allow-Origin</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Access-Control-Expose-Headers\"><code>Access-Control-Expose-Headers</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Access-Control-Max-Age\"><code>Access-Control-Max-Age</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Access-Control-Request-Headers\"><code>Access-Control-Request-Headers</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Access-Control-Request-Method\"><code>Access-Control-Request-Method</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Age\"><code>Age</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Allow\"><code>Allow</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Alt-Svc\"><code>Alt-Svc</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Alt-Used\"><code>Alt-Used</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Attribution-Reporting-Eligible\"><code>Attribution-Reporting-Eligible</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Attribution-Reporting-Register-Source\"><code>Attribution-Reporting-Register-Source</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Attribution-Reporting-Register-Trigger\"><code>Attribution-Reporting-Register-Trigger</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Authorization\"><code>Authorization</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Cache-Control\"><code>Cache-Control</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Clear-Site-Data\"><code>Clear-Site-Data</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Connection\"><code>Connection</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Digest\"><code>Digest</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Disposition\"><code>Content-Disposition</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-DPR\"><code>Content-DPR</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Encoding\"><code>Content-Encoding</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Language\"><code>Content-Language</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Length\"><code>Content-Length</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Location\"><code>Content-Location</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Range\"><code>Content-Range</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy\"><code>Content-Security-Policy</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only\"><code>Content-Security-Policy-Report-Only</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Type\"><code>Content-Type</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Cookie\"><code>Cookie</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Critical-CH\"><code>Critical-CH</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Cross-Origin-Embedder-Policy\"><code>Cross-Origin-Embedder-Policy</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Cross-Origin-Opener-Policy\"><code>Cross-Origin-Opener-Policy</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Cross-Origin-Resource-Policy\"><code>Cross-Origin-Resource-Policy</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Date\"><code>Date</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Device-Memory\"><code>Device-Memory</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/DNT\"><code>DNT</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Downlink\"><code>Downlink</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/DPR\"><code>DPR</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Early-Data\"><code>Early-Data</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/ECT\"><code>ECT</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/ETag\"><code>ETag</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Expect\"><code>Expect</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Expect-CT\"><code>Expect-CT</code></a><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Expires\"><code>Expires</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Forwarded\"><code>Forwarded</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/From\"><code>From</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Host\"><code>Host</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/If-Match\"><code>If-Match</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/If-Modified-Since\"><code>If-Modified-Since</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/If-None-Match\"><code>If-None-Match</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/If-Range\"><code>If-Range</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/If-Unmodified-Since\"><code>If-Unmodified-Since</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Keep-Alive\"><code>Keep-Alive</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Last-Modified\"><code>Last-Modified</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Link\"><code>Link</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Location\"><code>Location</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Max-Forwards\"><code>Max-Forwards</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/NEL\"><code>NEL</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/No-Vary-Search\"><code>No-Vary-Search</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Observe-Browsing-Topics\"><code>Observe-Browsing-Topics</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Origin\"><code>Origin</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Origin-Agent-Cluster\"><code>Origin-Agent-Cluster</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy\"><code>Permissions-Policy</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Pragma\"><code>Pragma</code></a><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Priority\"><code>Priority</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Proxy-Authenticate\"><code>Proxy-Authenticate</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Proxy-Authorization\"><code>Proxy-Authorization</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Range\"><code>Range</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Referer\"><code>Referer</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Referrer-Policy\"><code>Referrer-Policy</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Refresh\"><code>Refresh</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Report-To\"><code>Report-To</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Reporting-Endpoints\"><code>Reporting-Endpoints</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Repr-Digest\"><code>Repr-Digest</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Retry-After\"><code>Retry-After</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/RTT\"><code>RTT</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Save-Data\"><code>Save-Data</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-Browsing-Topics\"><code>Sec-Browsing-Topics</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-CH-Prefers-Color-Scheme\"><code>Sec-CH-Prefers-Color-Scheme</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Motion\"><code>Sec-CH-Prefers-Reduced-Motion</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-CH-Prefers-Reduced-Transparency\"><code>Sec-CH-Prefers-Reduced-Transparency</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA\"><code>Sec-CH-UA</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA-Arch\"><code>Sec-CH-UA-Arch</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA-Bitness\"><code>Sec-CH-UA-Bitness</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA-Full-Version\"><code>Sec-CH-UA-Full-Version</code></a><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/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=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA-Mobile\"><code>Sec-CH-UA-Mobile</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA-Model\"><code>Sec-CH-UA-Model</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA-Platform\"><code>Sec-CH-UA-Platform</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-CH-UA-Platform-Version\"><code>Sec-CH-UA-Platform-Version</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-Fetch-Dest\"><code>Sec-Fetch-Dest</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-Fetch-Mode\"><code>Sec-Fetch-Mode</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-Fetch-Site\"><code>Sec-Fetch-Site</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-Fetch-User\"><code>Sec-Fetch-User</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-GPC\"><code>Sec-GPC</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-Purpose\"><code>Sec-Purpose</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-WebSocket-Accept\"><code>Sec-WebSocket-Accept</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-WebSocket-Extensions\"><code>Sec-WebSocket-Extensions</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-WebSocket-Key\"><code>Sec-WebSocket-Key</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-WebSocket-Protocol\"><code>Sec-WebSocket-Protocol</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Sec-WebSocket-Version\"><code>Sec-WebSocket-Version</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Server\"><code>Server</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Server-Timing\"><code>Server-Timing</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Service-Worker-Navigation-Preload\"><code>Service-Worker-Navigation-Preload</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Set-Cookie\"><code>Set-Cookie</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Set-Login\"><code>Set-Login</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/SourceMap\"><code>SourceMap</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Speculation-Rules\"><code>Speculation-Rules</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Strict-Transport-Security\"><code>Strict-Transport-Security</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Supports-Loading-Mode\"><code>Supports-Loading-Mode</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/TE\"><code>TE</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Timing-Allow-Origin\"><code>Timing-Allow-Origin</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Tk\"><code>Tk</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Trailer\"><code>Trailer</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Transfer-Encoding\"><code>Transfer-Encoding</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Upgrade\"><code>Upgrade</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Upgrade-Insecure-Requests\"><code>Upgrade-Insecure-Requests</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/User-Agent\"><code>User-Agent</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Vary\"><code>Vary</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Via\"><code>Via</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Viewport-Width\"><code>Viewport-Width</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Want-Content-Digest\"><code>Want-Content-Digest</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Want-Repr-Digest\"><code>Want-Repr-Digest</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Warning\"><code>Warning</code></a><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Width\"><code>Width</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/WWW-Authenticate\"><code>WWW-Authenticate</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/X-Content-Type-Options\"><code>X-Content-Type-Options</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control\"><code>X-DNS-Prefetch-Control</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/X-Forwarded-For\"><code>X-Forwarded-For</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/X-Forwarded-Host\"><code>X-Forwarded-Host</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/X-Forwarded-Proto\"><code>X-Forwarded-Proto</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/X-Frame-Options\"><code>X-Frame-Options</code></a><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/X-XSS-Protection\"><code>X-XSS-Protection</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr></li></ol>\n </details>\n </li>\n <li class=\"toggle\">\n <details>\n <summary>HTTP 请求方法</summary>\n <ol><li><a href=\"/zh-CN/docs/Web/HTTP/Methods/CONNECT\"><code>CONNECT</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Methods/DELETE\"><code>DELETE</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Methods/GET\"><code>GET</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Methods/HEAD\"><code>HEAD</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Methods/OPTIONS\"><code>OPTIONS</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Methods/PATCH\"><code>PATCH</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Methods/POST\"><code>POST</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Methods/PUT\"><code>PUT</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Methods/TRACE\"><code>TRACE</code></a></li></ol>\n </details>\n </li>\n <li class=\"toggle\">\n <details>\n <summary>HTTP 响应状态码</summary>\n <ol><li><a href=\"/zh-CN/docs/Web/HTTP/Status/100\"><code>100 Continue</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/101\"><code>101 Switching Protocol</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/102\"><code>102 Processing</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/103\"><code>103 Early Hints</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/200\"><code>200 OK</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/201\"><code>201 Created</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/202\"><code>202 Accepted</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/203\"><code>203 Non-Authoritative Information</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/204\"><code>204 No Content</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/205\"><code>205 Reset Content</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/206\"><code>206 Partial Content</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/207\"><code>207 Multi-Status</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/208\"><code>208 Already Reported</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/226\"><code>226 IM Used</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/300\"><code>300 Multiple Choices</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/301\"><code>301 Moved Permanently</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/302\"><code>302 Found</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/303\"><code>303 See Other</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/304\"><code>304 Not Modified</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/307\"><code>307 Temporary Redirect</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/308\"><code>308 Permanent Redirect</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/400\"><code>400 Bad Request</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/401\"><code>401 Unauthorized</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/402\"><code>402 Payment Required</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/403\"><code>403 Forbidden</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/404\"><code>404 Not Found</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/405\"><code>405 Method Not Allowed</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/406\"><code>406 Not Acceptable</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/407\"><code>407 Proxy Authentication Required</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/408\"><code>408 Request Timeout</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/409\"><code>409 Conflict</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/410\"><code>410 Gone</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/411\"><code>411 Length Required</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/412\"><code>412 Precondition Failed</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/413\"><code>413 Content Too Large</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/414\"><code>414 URI Too Long</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/415\"><code>415 Unsupported Media Type</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/416\"><code>416 Range Not Satisfiable</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/417\"><code>417 Expectation Failed</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/418\"><code>418 I'm a teapot</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/421\"><code>421 Misdirected Request</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/422\"><code>422 Unprocessable Entity</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/423\"><code>423 Locked</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/424\"><code>424 Failed Dependency</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/425\"><code>425 Too Early</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/426\"><code>426 Upgrade Required</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/428\"><code>428 Precondition Required</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/429\"><code>429 Too Many Requests</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/431\"><code>431 Request Header Fields Too Large</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/451\"><code>451 Unavailable For Legal Reasons</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/500\"><code>500 Internal Server Error</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/501\"><code>501 Not Implemented</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/502\"><code>502 Bad Gateway</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/503\"><code>503 Service Unavailable</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/504\"><code>504 Gateway Timeout</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/505\"><code>505 HTTP Version Not Supported</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/506\"><code>506 Variant Also Negotiates</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/507\"><code>507 Insufficient Storage</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/508\"><code>508 Loop Detected</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/510\"><code>510 Not Extended</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Status/511\"><code>511 Network Authentication Required</code></a></li></ol>\n </details>\n </li>\n <li class=\"toggle\">\n <details>\n <summary>CSP 指令</summary>\n <ol><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/base-uri\"><code>CSP: base-uri</code></a></li><li><a href=\"/zh-CN/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=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/child-src\"><code>CSP: child-src</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/connect-src\"><code>CSP: connect-src</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/default-src\"><code>CSP：default-src</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/fenced-frame-src\"><code>CSP: fenced-frame-src</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/font-src\"><code>CSP: font-src</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/form-action\"><code>CSP: form-action</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/frame-ancestors\"><code>CSP：frame-ancestors</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/frame-src\"><code>CSP: frame-src</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/img-src\"><code>CSP: img-src</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/manifest-src\"><code>CSP: manifest-src</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/media-src\"><code>CSP: media-src</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/object-src\"><code>CSP: object-src</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/prefetch-src\"><code>CSP: prefetch-src</code></a><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/report-to\"><code>report-to</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/report-uri\"><code>CSP: report-uri</code></a><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/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=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/sandbox\"><code>CSP: sandbox</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/script-src\"><code>CSP: script-src</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/script-src-attr\"><code>CSP: script-src-attr</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/script-src-elem\"><code>CSP: script-src-elem</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/style-src\"><code>CSP: style-src</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/style-src-attr\"><code>CSP: style-src-attr</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/style-src-elem\"><code>CSP: style-src-elem</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/trusted-types\"><code>CSP: trusted-types</code></a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/upgrade-insecure-requests\"><code>CSP: upgrade-insecure-requests</code></a></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Security-Policy/worker-src\"><code>CSP: worker-src</code></a></li></ol>\n </details>\n </li>\n <li class=\"toggle\">\n <details>\n <summary>CORS 错误</summary>\n <ol><li><a href=\"/zh-CN/docs/Web/HTTP/CORS/Errors/CORSDisabled\">原因：CORS disabled</a></li><li><a href=\"/zh-CN/docs/Web/HTTP/CORS/Errors/CORSAllowOriginNotMatchingOrigin\">原因：CORS header 'Access-Control-Allow-Origin' does not match 'xyz'</a></li><li><a href=\"/zh-CN/docs/Web/HTTP/CORS/Errors/CORSMissingAllowOrigin\">原因：CORS header 'Access-Control-Allow-Origin' missing</a></li><li><a href=\"/zh-CN/docs/Web/HTTP/CORS/Errors/CORSOriginHeaderNotAdded\">原因：CORS header 'Origin' cannot be added</a></li><li><a href=\"/zh-CN/docs/Web/HTTP/CORS/Errors/CORSPreflightDidNotSucceed\">原因：CORS preflight channel did not succeed</a></li><li><a href=\"/zh-CN/docs/Web/HTTP/CORS/Errors/CORSDidNotSucceed\">原因：CORS request did not succeed</a></li><li><a href=\"/zh-CN/docs/Web/HTTP/CORS/Errors/CORSExternalRedirectNotAllowed\">原因：CORS request external redirect not allowed</a></li><li><a href=\"/zh-CN/docs/Web/HTTP/CORS/Errors/CORSRequestNotHttp\">原因：CORS request not HTTP</a></li><li><a href=\"/zh-CN/docs/Web/HTTP/CORS/Errors/CORSNotSupportingCredentials\">原因：Credential is not supported if the CORS header 'Access-Control-Allow-Origin' is '*'</a></li><li><a href=\"/zh-CN/docs/Web/HTTP/CORS/Errors/CORSMethodNotFound\">原因：Did not find method in CORS header 'Access-Control-Allow-Methods'</a></li><li><a href=\"/zh-CN/docs/Web/HTTP/CORS/Errors/CORSMIssingAllowCredentials\">原因：expected 'true' in CORS header 'Access-Control-Allow-Credentials'</a></li><li><a href=\"/zh-CN/docs/Web/HTTP/CORS/Errors/CORSInvalidAllowHeader\">原因：invalid token 'xyz' in CORS header 'Access-Control-Allow-Headers'</a></li><li><a href=\"/zh-CN/docs/Web/HTTP/CORS/Errors/CORSInvalidAllowMethod\">原因：invalid token 'xyz' in CORS header 'Access-Control-Allow-Methods'</a></li><li><a href=\"/zh-CN/docs/Web/HTTP/CORS/Errors/CORSMissingAllowHeaderFromPreflight\">原因：missing token 'xyz' in CORS header 'Access-Control-Allow-Headers' from CORS preflight channel</a></li><li><a href=\"/zh-CN/docs/Web/HTTP/CORS/Errors/CORSMultipleAllowOriginNotAllowed\">原因：Multiple CORS header 'Access-Control-Allow-Origin' not allowed</a></li></ol>\n </details>\n </li>\n <li class=\"toggle\">\n <details>\n <summary>权限策略指令</summary>\n <ol><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/accelerometer\">Permissions-Policy: accelerometer</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/ambient-light-sensor\">Permissions-Policy: ambient-light-sensor</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/attribution-reporting\">Permissions-Policy: attribution-reporting</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/autoplay\">Permissions-Policy: autoplay</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/bluetooth\">Permissions-Policy: bluetooth</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/browsing-topics\">Permissions-Policy: browsing-topics</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr><abbr class=\"icon icon-nonstandard\" title=\"非标准。请在使用前检查跨浏览器支持。\">\n <span class=\"visually-hidden\">非标准</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/camera\">Permissions-Policy: camera</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/compute-pressure\">Permissions-Policy: compute-pressure</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/display-capture\">Permissions-Policy: display-capture</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/document-domain\">Permissions-Policy: document-domain</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/encrypted-media\">Permissions-Policy: encrypted-media</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/fullscreen\">Permissions-Policy: fullscreen</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/gamepad\">Permissions-Policy: gamepad</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/geolocation\">Permissions-Policy: geolocation</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/gyroscope\">Permissions-Policy: gyroscope</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/hid\">Permissions-Policy: hid</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/identity-credentials-get\">Permissions-Policy: identity-credentials-get</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/idle-detection\">Permissions-Policy: idle-detection</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/local-fonts\">Permissions-Policy: local-fonts</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/magnetometer\">Permissions-Policy: magnetometer</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/microphone\">Permissions-Policy: microphone</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/midi\">Permissions-Policy: midi</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/otp-credentials\">Permissions-Policy: otp-credentials</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/payment\">Permissions-Policy: payment</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/picture-in-picture\">Permissions-Policy: picture-in-picture</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/publickey-credentials-create\">Permissions-Policy: publickey-credentials-create</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/publickey-credentials-get\">Permissions-Policy: publickey-credentials-get</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/screen-wake-lock\">Permissions-Policy: screen-wake-lock</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/serial\">Permissions-Policy: serial</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/speaker-selection\">Permissions-Policy: speaker-selection</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/storage-access\">Permissions-Policy: storage-access</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/usb\">Permissions-Policy: usb</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/web-share\">Permissions-Policy: web-share</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/window-management\">Permissions-Policy: window-management</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/HTTP/Headers/Permissions-Policy/xr-spatial-tracking\">Permissions-Policy: xr-spatial-tracking</a><abbr class=\"icon icon-experimental\" title=\"实验性。预期行为可能会在未来发生变更。\">\n <span class=\"visually-hidden\">实验性</span>\n</abbr></li></ol>\n </details>\n </li>\n <li><a href=\"/zh-CN/docs/Web/HTTP/Resources_and_specifications\">HTTP 资源与规范</a></li>\n </ol>\n","sidebarMacro":"HTTPSidebar","body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p><strong>数据压缩</strong>是提高 Web 站点性能的一种重要手段。对于有些文件来说，高达 70% 的压缩比率可以大大减低对于带宽的需求。随着时间的推移，压缩算法的效率也越来越高，同时也有新的压缩算法被发明出来，应用在客户端与服务器端。</p>\n<p>在实际应用时，web 开发者不需要亲手实现压缩机制，浏览器及服务器都已经将其实现了，不过他们需要确保在服务器端进行了合理的配置。数据压缩会在三个不同的层面发挥作用：</p>\n<ul>\n <li>首先某些格式的文件会采用特定的优化算法进行压缩，</li>\n <li>其次在 HTTP 协议层面会进行通用数据加密，即数据资源会以压缩的形式进行端到端传输，</li>\n <li>最后数据压缩还会发生在网络连接层面，即发生在 HTTP 连接的两个节点之间。</li>\n</ul>"}},{"type":"prose","value":{"id":"文件格式压缩","title":"文件格式压缩","isH3":false,"content":"<p>每一种文件类型都会存有冗余，也就是<em>浪费的空间</em>。如果一个典型的文本文件存在 60% 的冗余的话，那么对于其他类型的文件，例如音频或视频文件来说，这个比率会更高。不同于文本文件，这些其他类型的媒体文件占据的空间也更大，所以很早就出现了回收这些浪费的空间的需求。工程师们设计了可以应用于特定用途的文件类型的经过优化的算法。用于文件的压缩算法可以大致分为两类：</p>\n<ul>\n <li><em>无损压缩</em>。在压缩与解压缩的循环期间，不会对要恢复的数据进行修改。复原后的数据与原始数据是一致的（比特与比特之间一一对应）。对于图片文件来说，<code>gif</code> 或者 <code>png</code> 格式的文件就是采用了无损压缩算法。</li>\n <li><em>有损压缩</em>。在压缩与解压缩的循环期间，会对原始数据进行修改，但是会（希望）以用户无法觉察的方式进行。网络上的视频文件通常采用有损压缩算法，<code>jpeg</code> 格式的图片也是有损压缩。</li>\n</ul>\n<p>一些特定的文件格式既可以采用无损压缩算法，又可以采用有损压缩算法，例如 <code>webp</code>，并且有损压缩算法可以对压缩比率进行配置，当然这会导致压缩品质的不同。为了使一个站点获得更好的性能，理想情况是在保持可以接受的品质水准的前提下，压缩比率尽可能得高。对于图片来说，通过压缩工具生成的图片对于 Web 应用来说，优化程度可能依然不够高。一般建议选用在保持所要求的品质的前提下压缩比率尽可能高的工具。这里有<a href=\"https://www.creativebloq.com/design/image-compression-tools-1132865\" class=\"external\" target=\"_blank\">各种各样的工具</a>专门用来干这个。</p>\n<p>有损压缩通常会比无损压缩效率更高一些。</p>\n<div class=\"notecard note\">\n <p><strong>备注：</strong>由于数据压缩技术在一些特定类型的文件上效果很好，再次进行压缩通常没有什么效果。事实上，这种做法常常会适得其反，因为间接开销（该类型算法通常需要使用字典，而字典的大小是会计入初始大小的）会比在压缩过程中获取的额外收益要高，从而会使文件的体积增加。不要对压缩格式的文件应用如下两种压缩技术。</p>\n</div>"}},{"type":"prose","value":{"id":"端到端压缩技术","title":"端到端压缩技术","isH3":false,"content":"<p>对于各种压缩手段来说，端到端压缩技术是 Web 站点性能提升最大的地方。端到端压缩技术指的是消息主体的压缩是在服务器端完成的，并且在传输过程中保持不变，直到抵达客户端。不管途中遇到什么样的中间节点，它们都会使消息主体保持原样。</p>\n<p>\n <img src=\"/zh-CN/docs/Web/HTTP/Compression/httpenco1.svg\" alt=\"服务器通过网络节点向客户端发送一个压缩的 HTTP 主体。该主体直到到达客户端之前，不会在网络中的任何一跳之间进行解压缩。\" width=\"950\" height=\"463\" loading=\"lazy\">\n</p>\n<p>所有的现代浏览器及服务器都支持该技术，唯一需要协商的是所采用的压缩算法。这些压缩算法是为文本内容进行过优化的。在上世纪 90 年代，压缩技术快速发展，为数众多的算法相继出现，扩大了可选的范围。如今只有两种算法有着举足轻重的地位：<code>gzip</code> 应用最广泛，<code>br</code> 则是新的挑战者。</p>\n<p>为了选择要采用的压缩算法，浏览器和服务器之间会使用<a href=\"/zh-CN/docs/Web/HTTP/Content_negotiation\">主动协商机制</a>。浏览器发送 <a href=\"/zh-CN/docs/Web/HTTP/Headers/Accept-Encoding\"><code>Accept-Encoding</code></a> 标头，其中包含有它所支持的压缩算法，以及各自的优先级，服务器则从中选择一种，使用该算法对响应的消息主体进行压缩，并且发送 <a href=\"/zh-CN/docs/Web/HTTP/Headers/Content-Encoding\"><code>Content-Encoding</code></a> 标头来告知浏览器它选择了哪一种算法。由于该内容协商过程是基于编码类型来选择资源的展现形式的，在响应时，服务器至少发送一个包含 <a href=\"/zh-CN/docs/Web/HTTP/Headers/Accept-Encoding\"><code>Accept-Encoding</code></a> 的 <a href=\"/zh-CN/docs/Web/HTTP/Headers/Vary\"><code>Vary</code></a> 标头以及该标头；这样的话，缓存服务器就可以对资源的不同展现形式进行缓存。</p>\n<p>\n <img src=\"/zh-CN/docs/Web/HTTP/Compression/httpcompression1.svg\" alt=\"客户端使用“Accept-Encoding:br, gzip”标头请求内容。服务器使用 Brotli 算法压缩的主体以及所需的“Content-Encoding”和“Vary”标头进行响应。\" width=\"850\" height=\"479\" loading=\"lazy\">\n</p>\n<p>由于压缩技术可以带来很大的性能提升，建议对除了已经经过压缩的文件如图片、音频和视频文件之外的其他类型的文件均进行压缩。</p>\n<p>Apache 服务器支持数据压缩，有 <a href=\"https://httpd.apache.org/docs/current/mod/mod_deflate.html\" class=\"external\" target=\"_blank\">mod_deflate</a>可供使用；nginx 中有<a href=\"http://nginx.org/en/docs/http/ngx_http_gzip_module.html\" class=\"external\" target=\"_blank\">ngx_http_gzip_module</a> 模块；在 IIS 中则可以使用 <a href=\"https://www.iis.net/configreference/system.webserver/httpcompression\" class=\"external\" target=\"_blank\"><code><httpCompression></code></a> 元素。</p>"}},{"type":"prose","value":{"id":"逐跳压缩技术","title":"逐跳压缩技术","isH3":false,"content":"<p>逐跳压缩技术尽管与端到端压缩技术有些类似，但是它们在一点上有着本质的区别：即这里的压缩指的不是对源头服务器上的资源的压缩，以此来创建一份特定的展现形式然后进行传输，而是对客户端与服务器端之间的任意两个节点之间传递的消息的主体的压缩。在两个相邻的中间节点之间的连接上，可能会应用<em>不同</em>的压缩方式。</p>\n<p>\n <img src=\"/zh-CN/docs/Web/HTTP/Compression/httpte1.svg\" alt=\"服务器通过网络节点向客户端发送一个未经压缩的 HTTP 主体。该主体在到达客户端之前，由网络上的节点根据“Transfer-Encoding”标头进行压缩和解压缩。\" width=\"1132\" height=\"624\" loading=\"lazy\">\n</p>\n<p>为了实现这个目的，HTTP 协议中采用了与端到端压缩技术所使用的内容协商机制相类似的机制：节点发送请求，使用 <a href=\"/zh-CN/docs/Web/HTTP/Headers/TE\"><code>TE</code></a> 标头来宣告它的意愿，另外一个节点则从中选择合适的方法，进行应用，然后在 <a href=\"/zh-CN/docs/Web/HTTP/Headers/Transfer-Encoding\"><code>Transfer-Encoding</code></a> 标头中指出它所选择的方法。</p>\n<p>\n <img src=\"/zh-CN/docs/Web/HTTP/Compression/httpcomp2.svg\" alt=\"客户端从没有压缩相关标头的服务器请求内容。服务器会使用未经压缩的主体进行响应。该主体在到达客户端之前，由网络上的节点进行压缩和解压缩。\" width=\"951\" height=\"943\" loading=\"lazy\">\n</p>\n<p>在实际应用中，逐跳压缩对于服务器和客户端来说是不可见的，并且很少使用。<a href=\"/zh-CN/docs/Web/HTTP/Headers/TE\"><code>TE</code></a> 标头和 <a href=\"/zh-CN/docs/Web/HTTP/Headers/Transfer-Encoding\"><code>Transfer-Encoding</code></a> 标头最常用来发送分块响应，允许在获得资源的确切长度之前就可以开始传输。</p>\n<p>注意，在单次转发层面使用 <a href=\"/zh-CN/docs/Web/HTTP/Headers/Transfer-Encoding\"><code>Transfer-Encoding</code></a> 标头和压缩技术是如此地少见，以至于 Apache、nginx 或 IIS 等服务器都不太容易配置。此类配置通常用在代理服务器层面。</p>"}}],"toc":[{"text":"文件格式压缩","id":"文件格式压缩"},{"text":"端到端压缩技术","id":"端到端压缩技术"},{"text":"逐跳压缩技术","id":"逐跳压缩技术"}],"summary":"数据压缩是提高 Web 站点性能的一种重要手段。对于有些文件来说，高达 70% 的压缩比率可以大大减低对于带宽的需求。随着时间的推移，压缩算法的效率也越来越高，同时也有新的压缩算法被发明出来，应用在客户端与服务器端。","popularity":0,"modified":"2024-07-27T04:01:26.000Z","other_translations":[{"locale":"de","title":"Compression in HTTP","native":"Deutsch"},{"locale":"en-US","title":"Compression in HTTP","native":"English (US)"},{"locale":"fr","title":"Compression dans HTTP","native":"Français"},{"locale":"ja","title":"HTTP の圧縮","native":"日本語"},{"locale":"ko","title":"HTTP에서의 압축","native":"한국어"},{"locale":"pt-BR","title":"Compressão em HTTP","native":"Português (do Brasil)"}],"pageType":"unknown","source":{"folder":"zh-cn/web/http/compression","github_url":"https://github.com/mdn/translated-content/blob/main/files/zh-cn/web/http/compression/index.md","last_commit_url":"https://github.com/mdn/translated-content/commit/9615d161268fd8b09648f24d86441fb966c630d3","filename":"index.md"},"short_title":"HTTP 协议中的数据压缩","parents":[{"uri":"/zh-CN/docs/Web","title":"面向开发者的 Web 技术"},{"uri":"/zh-CN/docs/Web/HTTP","title":"HTTP"},{"uri":"/zh-CN/docs/Web/HTTP/Compression","title":"HTTP 协议中的数据压缩"}],"pageTitle":"HTTP 协议中的数据压缩 - HTTP | MDN","noIndexing":false}}</script></body></html>