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+---
+title: 428 Precondition Required
+slug: Web/HTTP/Status/428
+tags:
+  - HTTP
+  - 客户端错误
+  - 状态码
+translation_of: Web/HTTP/Status/428
+---
+<div>{{HTTPSidebar}}</div>
+
+<p>在HTTP协议中，响应状态码  <code><strong>428 Precondition Required</strong></code> 表示服务器端要求发送<a href="/en-US/docs/Web/HTTP/Conditional_requests">条件</a>请求。</p>
+
+<p>一般的，这种情况意味着必要的条件首部——如 {{HTTPHeader("If-Match")}} ——的<strong>缺失。</strong>.</p>
+
+<p>当一个条件首部的值<strong>不能匹配</strong>服务器端的状态的时候，应答的状态码应该是 {{HTTPStatus(412)}} <code>Precondition Failed</code>，前置条件验证失败。</p>
+
+<h2 id="状态">状态</h2>
+
+<pre class="syntaxbox">428 Precondition Required</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("6585", "428 Precondition Required" , "3")}}</td>
+   <td>Additional HTTP Status Codes</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="相关内容">相关内容</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/HTTP/Conditional_requests">HTTP conditional requests</a></li>
+ <li>{{HTTPHeader("If-Match")}}</li>
+ <li>{{HTTPStatus(412)}}</li>
+</ul>