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+---
+title: Request.headers
+slug: Web/API/Request/headers
+translation_of: Web/API/Request/headers
+---
+<div>{{APIRef("Fetch")}}</div>
+
+<p>{{domxref("Request")}}接口的只读属性  <strong><code>headers</code></strong> 包含与当前请求关联的{{domxref("Headers")}}对象.</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">var <var>myHeaders</var> = <var>request</var>.headers;</pre>
+
+<h3 id="值">值</h3>
+
+<p>一个 {{domxref("Headers")}} 对象.</p>
+
+<h2 id="例子">例子</h2>
+
+<p>在下面的代码段中，我们使用 {{domxref("Request.Request()")}} 构造函数（为获取与脚本处于同一目录的图片文件）创建新请求，然后将请求headers保存到变量中:</p>
+
+<pre class="brush: js">var myRequest = new Request('flowers.jpg');
+var myHeaders = myRequest.headers; // Headers {}</pre>
+
+<p>使用 {{domxref("Headers.append")}} 向 {{domxref("Headers")}} 对象中添加header；然后，使用第二个init参数创建一个新的 <code>Request</code> ，同时，传递headers作为一个init选项:</p>
+
+<pre class="brush: js">var myHeaders = new Headers();
+myHeaders.append('Content-Type', 'image/jpeg');
+
+var myInit = { method: 'GET',
+                   headers: myHeaders,
+                   mode: 'cors',
+                   cache: 'default' };
+
+var myRequest = new Request('flowers.jpg',myInit);
+
+myContentType = myRequest.headers.get('Content-Type'); // returns 'image/jpeg'</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Fetch','#dom-request-headers','headers')}}</td>
+   <td>{{Spec2('Fetch')}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("api.Request.headers")}}</p>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/API/ServiceWorker_API">ServiceWorker API</a></li>
+ <li><a href="/en-US/docs/Web/HTTP/Access_control_CORS">HTTP access control (CORS)</a></li>
+ <li><a href="/en-US/docs/Web/HTTP">HTTP</a></li>
+</ul>
+
+<div id="SL_balloon_obj" style="display: block;">
+<div class="SL_ImTranslatorLogo" id="SL_button" style="background: rgba(0, 0, 0, 0)  repeat scroll 0% 0%; display: none; opacity: 1; left: -8px; top: -25px;"> </div>
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