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+---
+title: Age
+slug: Web/HTTP/Headers/Age
+tags:
+ - 响应头
+ - 缓存
+ - 首部
+translation_of: Web/HTTP/Headers/Age
+---
+<div>{{HTTPSidebar}}</div>
+
+<p><code><strong>Age</strong></code> 消息头里包含对象在缓存代理中存贮的时长,以秒为单位。.</p>
+
+<p>Age的值通常接近于0。表示此对象刚刚从原始服务器获取不久;其他的值则是表示代理服务器当前的系统时间与此应答中的通用头 {{HTTPHeader("Date")}} 的值之差。</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">Age: &lt;delta-seconds&gt;
+</pre>
+
+<h2 id="指令">指令</h2>
+
+<dl>
+ <dt>&lt;delta-seconds&gt;</dt>
+ <dd>
+ <p>一个非负整数,表示对象在缓存代理服务器中存贮的时长,以秒为单位。</p>
+ </dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<pre>Age: 24</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+ <tr>
+ <th scope="col">规范</th>
+ <th scope="col">标题</th>
+ </tr>
+ <tr>
+ <td>{{RFC("7234", "Age", "5.1")}}</td>
+ <td>超文本协议 (HTTP/1.1): 缓存</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容情况">浏览器兼容情况</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.Age")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{HTTPHeader("Cache-Control")}}</li>
+ <li>{{HTTPHeader("Expires")}}</li>
+</ul>