---
title: Accept
slug: Web/HTTP/Headers/Accept
translation_of: Web/HTTP/Headers/Accept
---
<div>{{HTTPSidebar}}</div>

<p><strong><code>Accept</code></strong> HTTP 請求標頭（以 <a href="/zh-TW/docs/Web/HTTP/Basics_of_HTTP/MIME_types">MIME type</a> 標示）會對伺服器告知用戶端可解讀的內容類型。伺服器可以透過 <a href="/zh-TW/docs/Web/HTTP/Content_negotiation">content negotiation</a> 來選用可行的協定，並以 {{HTTPHeader("Content-Type")}} 標頭告知用戶端。針對本標頭，瀏覽器可以根據完成請求的脈絡，來決定適合的數值：像是擷取 CSS 時，給予的值就會和圖片、影像、腳本不一樣。</p>

<table class="properties">
 <tbody>
  <tr>
   <th scope="row">標頭類型</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("CORS-safelisted request header")}}</th>
   <td>yes, with the additional restriction that values can't contain a <em>CORS-unsafe request header byte</em>: <code>"():&lt;&gt;?@[\]{}</code>, Delete, Tab and control characters: 0x00 to 0x19.</td>
  </tr>
 </tbody>
</table>

<h2 id="語法">語法</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, image/webp, */*;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>一個精確的 <a href="/zh-TW/docs/Web/HTTP/Basics_of_HTTP/MIME_types">MIME type</a>，例如<code>text/html</code>。</dd>
 <dt><code>&lt;MIME_type&gt;/*</code></dt>
 <dd>一個不指定子類的 MIME type。<code>image/*</code> 會配對到 <code>image/png</code>, <code>image/svg</code>, <code>image/gif</code> 和等圖片類型。</dd>
 <dt><code>*/*</code></dt>
 <dd>所有 MIME type</dd>
 <dt><code>;q=</code> (q-factor weighting)</dt>
 <dd>Any value used is placed in an order of preference expressed using relative <a href="/en-US/docs/Glossary/Quality_values">quality value</a> called the <em>weight</em>.</dd>
</dl>

<h2 id="示例">示例</h2>

<pre>Accept: text/html

Accept: image/*

// General default
Accept: */*

// Default for navigation requests
Accept: text/html, application/xhtml+xml, application/xml;q=0.9, */*;q=0.8
</pre>

<h2 id="規範">規範</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">規範</th>
   <th scope="col">標題</th>
  </tr>
 </thead>
 <tbody>
  <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="瀏覽器相容性">瀏覽器相容性</h2>

<p>{{Compat("http.headers.Accept")}}</p>

<h2 id="參見">參見</h2>

<ul>
 <li>HTTP <a href="/zh-TW/docs/Web/HTTP/Content_negotiation">content negotiation</a></li>
 <li>Header with the result of the content negotiation: {{HTTPHeader("Content-Type")}}</li>
 <li>類似標頭：{{HTTPHeader("TE")}}, {{HTTPHeader("Accept-Encoding")}}, {{HTTPHeader("Accept-Charset")}}, {{HTTPHeader("Accept-Language")}}</li>
</ul>