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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: Accept
+slug: Web/HTTP/Headers/Accept
+translation_of: Web/HTTP/Headers/Accept
+---
+<div>{{HTTPSidebar}}</div>
+
+<p><strong><code>Accept</code></strong> 请求头用来告知(服务器)客户端可以处理的内容类型,这种内容类型用<a href="/zh-CN/docs/Web/HTTP/Basics_of_HTTP/MIME_types">MIME类型</a>来表示。借助<a href="/en-US/docs/Web/HTTP/Content_negotiation">内容协商机制</a>, 服务器可以从诸多备选项中选择一项进行应用,并使用 {{HTTPHeader("Content-Type")}} 应答头通知客户端它的选择。浏览器会基于请求的上下文来为这个请求头设置合适的值,比如获取一个CSS层叠样式表时值与获取图片、视频或脚本文件时的值是不同的。</p>
+
+<table class="properties">
+ <tbody>
+ <tr>
+ <th scope="row">Header type</th>
+ <td>{{Glossary("Request header")}}</td>
+ </tr>
+ <tr>
+ <th scope="row">{{Glossary("Forbidden header name")}}</th>
+ <td>no</td>
+ </tr>
+ <tr>
+ <th scope="row">{{Glossary("Simple header", "CORS-safelisted request-header")}}</th>
+ <td>yes</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">Accept: &lt;MIME_type&gt;/&lt;MIME_subtype&gt;
+Accept: &lt;MIME_type&gt;/*
+Accept: */*
+
+// Multiple types, weighted with the {{glossary("quality values", "quality value")}} syntax:
+Accept: text/html, application/xhtml+xml, application/xml;q=0.9, */*;q=0.8</pre>
+
+<h2 id="指令">指令</h2>
+
+<dl>
+ <dt><code>&lt;MIME_type&gt;/&lt;MIME_subtype&gt;</code></dt>
+ <dd>单一精确的 <a href="/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types">MIME </a>类型, 例如<code>text/html</code>.</dd>
+ <dt><code>&lt;MIME_type&gt;/*</code></dt>
+ <dd>一类 MIME 类型, 但是没有指明子类。 <code>image/*</code> 可以用来指代 <code>image/png</code>, <code>image/svg</code>, <code>image/gif</code> 以及任何其他的图片类型。</dd>
+ <dt><code>*/*</code></dt>
+ <dd>任意类型的 MIME 类型</dd>
+ <dt><code>;q=</code> (q因子权重)</dt>
+ <dd>值代表优先顺序,用相对<a href="/en-US/docs/Glossary/Quality_values">质量价值</a>表示,又称作权重。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<pre>Accept: text/html
+
+Accept: image/*
+
+Accept: text/html, application/xhtml+xml, application/xml;q=0.9, */*;q=0.8
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">Specification</th>
+ <th scope="col">Title</th>
+ </tr>
+ <tr>
+ <td>{{RFC("7231", "Accept", "5.3.2")}}</td>
+ <td>Hypertext Transfer Protocol (HTTP/1.1): Semantics and Context</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("http.headers.Accept")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>HTTP <a href="/en-US/docs/Web/HTTP/Content_negotiation">内容协商 </a></li>
+ <li>表示内容协商结果的消息头: {{HTTPHeader("Content-Type")}}</li>
+ <li>其他相似消息头: {{HTTPHeader("TE")}}, {{HTTPHeader("Accept-Encoding")}}, {{HTTPHeader("Accept-Charset")}}, {{HTTPHeader("Accept-Language")}}</li>
+</ul>