---
title: 101 Switching Protocol
slug: Web/HTTP/Status/101
tags:
  - HTTP
  - HTTP 状态码
translation_of: Web/HTTP/Status/101
---
<div>{{HTTPSidebar}}</div>

<p>HTTP  <code><strong>101 Switching Protocol</strong></code>（协议切换）状态码表示服务器应客户端升级协议的请求（{{HTTPHeader("Upgrade")}}请求头）正在切换协议。</p>

<p>服务器会发送一个{{HTTPHeader("Upgrade")}}响应头来表明其正在切换过去的协议。<br>
 该过程在协议升级机制(<a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Protocol_upgrade_mechanism">Protocol upgrade mechanism</a>)中详细描述。</p>

<h2 id="状态">状态</h2>

<pre class="syntaxbox notranslate">101 Switching Protocol</pre>

<h2 id="示例">示例</h2>

<p>在使用 <a href="/en-US/docs/Web/API/WebSockets_API">WebSockets</a> 时会用到协议切换。</p>

<pre class="notranslate">HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade</pre>

<h2 id="相关协议">相关协议</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Title</th>
  </tr>
  <tr>
   <td>{{RFC("7231", "101 Switching Protocol" , "6.2.2")}}</td>
   <td>Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content</td>
  </tr>
 </tbody>
</table>

<h2 id="参见">参见</h2>

<ul>
 <li><a href="/en-US/docs/Web/HTTP/Protocol_upgrade_mechanism">Protocol upgrade mechanism</a></li>
 <li><a href="/en-US/docs/Web/API/WebSockets_API">WebSockets</a></li>
 <li>{{HTTPHeader("Upgrade")}}</li>
 <li>{{HTTPStatus("426")}} <code>Upgrade Required</code></li>
</ul>