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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: Access-Control-Max-Age
+slug: Web/HTTP/Headers/Access-Control-Max-Age
+tags:
+ - 超文本传输协议
+ - 跨域资源请求
+ - 首部
+translation_of: Web/HTTP/Headers/Access-Control-Max-Age
+---
+<div>{{HTTPSidebar}}</div>
+
+<p>The <strong><code>Access-Control-Max-Age</code></strong> 这个响应头表示 {{glossary("preflight request")}}  (预检请求)的返回结果(即 {{HTTPHeader("Access-Control-Allow-Methods")}} 和{{HTTPHeader("Access-Control-Allow-Headers")}} 提供的信息) 可以被缓存多久。</p>
+
+<table class="properties">
+ <tbody>
+ <tr>
+ <th scope="row">报头类型</th>
+ <td>{{Glossary("Response header")}}</td>
+ </tr>
+ <tr>
+ <th scope="row">{{Glossary("Forbidden header name")}}</th>
+ <td>no</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">Access-Control-Max-Age: &lt;delta-seconds&gt;
+</pre>
+
+<h2 id="指令">指令</h2>
+
+<dl>
+ <dt>&lt;delta-seconds&gt;</dt>
+ <dd>返回结果可以被缓存的最长时间(秒)。<br>
+ 在 Firefox 中,<a href="https://dxr.mozilla.org/mozilla-central/rev/7ae377917236b7e6111146aa9fb4c073c0efc7f4/netwerk/protocol/http/nsCORSListenerProxy.cpp#1131">上限是24小时</a> (即 86400 秒)。<br>
+ 在 Chromium v76 之前, <a href="https://cs.chromium.org/chromium/src/services/network/public/cpp/cors/preflight_result.cc?l=36&amp;rcl=52002151773d8cd9ffc5f557cd7cc880fddcae3e">上限是 10 分钟</a>(即 600 秒)。<br>
+ 从 Chromium v76 开始,<a href="https://cs.chromium.org/chromium/src/services/network/public/cpp/cors/preflight_result.cc?l=31&amp;rcl=49e7c0b4886cac1f3d09dc046bd528c9c811a0fa">上限是 2 小时</a>(即 7200 秒)。<br>
+ Chromium 同时规定了一个默认值 5 秒。<br>
+ 如果值为 <strong>-1</strong>,表示禁用缓存,则每次请求前都需要使用 OPTIONS 预检请求。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<p>将预检请求的结果缓存10分钟:</p>
+
+<pre>Access-Control-Max-Age: 600 </pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">规范</th>
+ <th scope="col">状态</th>
+ <th scope="col">注释</th>
+ </tr>
+ <tr>
+ <td>{{SpecName('Fetch','#http-access-control-max-age', 'Access-Control-Max-Age')}}</td>
+ <td>{{Spec2("Fetch")}}</td>
+ <td>Initial definition.</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.Access-Control-Max-Age")}}</p>
+
+<h2 id="相关内容">相关内容</h2>
+
+<ul>
+ <li>{{HTTPHeader("Access-Control-Allow-Headers")}}</li>
+ <li>{{HTTPHeader("Access-Control-Allow-Methods")}}</li>
+</ul>