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+---
+title: Keep-Alive
+slug: Web/HTTP/Headers/Keep-Alive
+tags:
+ - HTTP
+ - HTTP Headers
+translation_of: Web/HTTP/Headers/Keep-Alive
+---
+<div>{{HTTPSidebar}}</div>
+
+<p><code><strong>Keep-Alive</strong></code> 是一个通用消息头,允许消息发送者暗示连接的状态,还可以用来设置超时时长和最大请求数。</p>
+
+<div class="note">
+<p>需要将 The {{HTTPHeader("Connection")}} 首部的值设置为  "keep-alive" 这个首部才有意义。同时需要注意的是,在HTTP/2 协议中, {{HTTPHeader("Connection")}} 和 {{HTTPHeader("Keep-Alive")}}  是被忽略的;在其中采用其他机制来进行连接管理。</p>
+</div>
+
+<table class="properties">
+ <tbody>
+ <tr>
+ <th scope="row">Header type</th>
+ <td>{{Glossary("General 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">Keep-Alive: <em>parameters</em></pre>
+
+<h2 id="指令">指令</h2>
+
+<dl>
+ <dt><em>parameters</em></dt>
+ <dd>一系列用逗号隔开的参数,每一个参数由一个标识符和一个值构成,并使用等号 (<code>'='</code>) 隔开。下述标识符是可用的:
+ <ul>
+ <li><code>timeout</code>:指定了一个空闲连接需要保持打开状态的最小时长(以秒为单位)。需要注意的是,如果没有在传输层设置 keep-alive TCP message 的话,大于 TCP 层面的超时设置会被忽略。</li>
+ <li><code>max</code>:在连接关闭之前,在此连接可以发送的请求的最大值。在非管道连接中,除了 0 以外,这个值是被忽略的,因为需要在紧跟着的响应中发送新一次的请求。HTTP 管道连接则可以用它来限制管道的使用。</li>
+ </ul>
+ </dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<p><code><font face="Open Sans, arial, sans-serif">含有 </font>Keep-Alive</code> 首部的响应示例:</p>
+
+<pre>HTTP/1.1 200 OK
+<strong>Connection: Keep-Alive</strong>
+Content-Encoding: gzip
+Content-Type: text/html; charset=utf-8
+Date: Thu, 11 Aug 2016 15:23:13 GMT
+<strong>Keep-Alive: timeout=5, max=1000</strong>
+Last-Modified: Mon, 25 Jul 2016 04:32:39 GMT
+Server: Apache
+
+(body)</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><a href="https://tools.ietf.org/id/draft-thomson-hybi-http-timeout-01.html#rfc.section.2">HyperText Transport Protocol Keep-Alive Header</a></td>
+ <td>The Keep-Alive Header (Experimental specification)</td>
+ </tr>
+ <tr>
+ <td><a href="https://tools.ietf.org/html/rfc7230#appendix-A.1.2">RFC 7230, appendix A.1.2: Keep-Alive</a></td>
+ <td>Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing</td>
+ </tr>
+ <tr>
+ <td>{{RFC("2068", "The Keep-Alive Header", "19.7.1.1")}}</td>
+ <td>Hypertext Transfer Protocol -- HTTP/1.1</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.Keep-Alive")}}</p>
+
+<h2 id="相关内容">相关内容</h2>
+
+<ul>
+ <li>{{HTTPHeader("Connection")}}</li>
+ <li><a href="/en-US/docs/Web/HTTP/Connection_management_in_HTTP_1.x">Connection management in HTTP/1.x</a></li>
+</ul>