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: 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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