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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>
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