From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: Expires
+slug: Web/HTTP/Headers/Expires
+tags:
+  - 缓存，头部，HTTP，响应，response
+translation_of: Web/HTTP/Headers/Expires
+---
+<div>{{HTTPSidebar}}</div>
+
+<div><code><strong>Expires</strong></code> 响应头包含日期/时间， 即在此时候之后，响应过期。</div>
+
+<div> </div>
+
+<p>无效的日期，比如 0, 代表着过去的日期，即该资源已经过期。</p>
+
+<p>如果在{{HTTPHeader("Cache-Control")}}响应头设置了 "max-age" 或者 "s-max-age" 指令，那么 <code>Expires</code> 头会被忽略。</p>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th scope="row">Header type</th>
+   <td>{{Glossary("Response header")}}</td>
+  </tr>
+  <tr>
+   <th scope="row">{{Glossary("Forbidden header name")}}</th>
+   <td>no</td>
+  </tr>
+  <tr>
+   <th scope="row">{{Glossary("Simple response header", "CORS-safelisted response-header")}}</th>
+   <td>yes</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">Expires: &lt;http-date&gt;
+</pre>
+
+<h2 id="指南">指南</h2>
+
+<dl>
+ <dt>&lt;http-date&gt;</dt>
+ <dd>
+ <p>一个 HTTP-日期 时间戳</p>
+ </dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<pre>Expires: Wed, 21 Oct 2015 07:28:00 GMT</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("7234", "Expires", "5.3")}}</td>
+   <td>Hypertext Transfer Protocol (HTTP/1.1): Caching</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p class="hidden">本页面的兼容表格是由结构化数据生成的。 如果您想帮助我们完善，可以checkout <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> 然后给我们发送pull请求</p>
+
+<p>{{Compat("http.headers.Expires")}}</p>
+
+<h2 id="其他">其他</h2>
+
+<ul>
+ <li>{{HTTPHeader("Cache-Control")}}</li>
+ <li>{{HTTPHeader("Age")}}</li>
+</ul>
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