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+---
+title: Save-Data
+slug: Web/HTTP/Headers/Save-Data
+tags:
+ - HTTP
+ - HTTP Header
+ - Reference
+ - Request header
+ - Save-Data
+ - header
+translation_of: Web/HTTP/Headers/Save-Data
+---
+<p>{{HTTPSidebar}}</p>
+
+<p>Save-Data请求头字段是一个布尔值,在请求中,表示客户端对减少数据使用量的偏好。 这可能是传输成本高,连接速度慢等原因。</p>
+
+<p>值为on时,明确表示用户选择使用客户端简化数据使用模式,并且当与源进行通信时允许他们提供替代内容以减少下载的数据,例如较小的图像和视频资源,不同的标记和样式,禁用轮询和自动更新等。</p>
+
+<div class="blockIndicator note">
+<p><strong>提示</strong>: 禁用 HTTP/2 服务器端推送 ({{RFC("7540", "Server Push", "8.2")}})也可以用于减少数据下载。</p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">Save-Data: &lt;sd-token&gt;</pre>
+
+<h2 id="指令">指令</h2>
+
+<dl>
+ <dt>&lt;<code>sd-token</code>&gt;</dt>
+ <dd>一个数值,表示客户端是否想要选择简化数据使用模式。 on表示是,而off(默认值)表示不。</dd>
+</dl>
+
+<h2 id="示例">示例</h2>
+
+<p>请求头{{HTTPHeader("Vary")}} 确保正确缓存内容(例如,当Save-Data标头不再存在时,确保不从缓存向用户提供较低质量的图像[例如在从蜂窝网络切换到Wi-Fi后])</p>
+
+<h3 id="携带_Save-Data_on_请求头">携带 <code>Save-Data: on</code> 请求头</h3>
+
+<p>请求示例:</p>
+
+<pre>GET /image.jpg HTTP/1.0
+Host: example.com
+Save-Data: on</pre>
+
+<p>响应示例:</p>
+
+<pre>HTTP/1.0 200 OK
+Content-Length: 102832
+Vary: Accept-Encoding, Save-Data
+Cache-Control: public, max-age=31536000
+Content-Type: image/jpeg
+
+[...]
+</pre>
+
+<h3 id="不携带_Save-Data请求头">不携带 <code>Save-Data请求头</code></h3>
+
+<p>请求示例:</p>
+
+<pre>GET /image.jpg HTTP/1.0
+Host: example.com
+</pre>
+
+<p>响应示例:</p>
+
+<pre>HTTP/1.0 200 OK
+Content-Length: 481770
+Vary: Accept-Encoding, Save-Data
+Cache-Control: public, max-age=31536000
+Content-Type: image/jpeg
+
+[...]
+</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><a href="https://tools.ietf.org/html/draft-grigorik-http-client-hints-03#section-7">draft-grigorik-http-client-hints-03, section 7: Save-Data</a></td>
+ <td>HTTP Client Hints</td>
+ </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("http.headers.Save-Data")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li><a href="https://css-tricks.com/help-users-save-data/">Help Your Users `Save-Data` - CSS Tricks</a></li>
+ <li><a href="https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/save-data/">Delivering Fast and Light Applications with Save-Data - Google Developers</a></li>
+ <li><a href="https://wicg.github.io/netinfo/#save-data-request-header-field">Network Information API - WICG</a></li>
+ <li>Header to indicate that the content served varies by <code>Save-Data</code>: {{HTTPHeader("Vary")}}</li>
+</ul>