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---
title: 426 Upgrade Required
slug: Web/HTTP/Status/426
tags:
- 响应状态码
- 客户端错误
translation_of: Web/HTTP/Status/426
---
<div>{{HTTPSidebar}}</div>
<p><code><strong>426 Upgrade Required</strong></code> 是一种HTTP协议的错误状态代码，表示服务器拒绝处理客户端使用当前协议发送的请求，但是可以接受其使用升级后的协议发送的请求。</p>
<p>服务器会在响应中使用 {{HTTPHeader("Upgrade")}} 首部来指定要求的协议。</p>
<h2 id="状态">状态</h2>
<pre class="syntaxbox">426 Upgrade Required</pre>
<h2 id="示例">示例</h2>
<pre>HTTP/1.1 426 Upgrade Required
Upgrade: HTTP/3.0
Connection: Upgrade
Content-Length: 53
Content-Type: text/plain
This service requires use of the HTTP/3.0 protocol</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("7231", "426 Upgrade Required" , "6.5.15")}}</td>
<td>Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content</td>
</tr>
</tbody>
</table>
<h2 id="相关内容">相关内容</h2>
<ul>
<li>{{HTTPHeader("Upgrade")}}</li>
<li>{{HTTPStatus("101")}} <code>Switching Protocol</code></li>
</ul>
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