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+---
+title: XMLHttpRequest.getAllResponseHeaders()
+slug: Web/API/XMLHttpRequest/getAllResponseHeaders
+translation_of: Web/API/XMLHttpRequest/getAllResponseHeaders
+---
+<p>{{draft}}{{APIRef('XMLHttpRequest')}}</p>
+
+<p><strong>XMLHttpRequest.getAllResponseHeaders()</strong> 方法返回所有的响应头，以 {{Glossary('CRLF')}} 分割的字符串，或者 <code>null</code> 如果没有收到任何响应。<strong> 注意：</strong> 对于复合请求 （ multipart requests ），这个方法返回当前请求的头部，而不是最初的请求的头部。</p>
+
+<pre class="syntaxbox">DOMString getAllResponseHeaders();</pre>
+
+<h2 id="语法">语法</h2>
+
+<pre>var headers = <var>XMLHttpRequest</var>.getAllResponseHeaders();
+</pre>
+
+<h3 id="参数">参数</h3>
+
+<p>无。</p>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个原始的header头例子：</p>
+
+<pre><code>date: Fri, 08 Dec 2017 21:04:30 GMT\r\n
+content-encoding: gzip\r\n
+x-content-type-options: nosniff\r\n
+server: meinheld/0.6.1\r\n
+x-frame-options: DENY\r\n
+content-type: text/html; charset=utf-8\r\n
+connection: keep-alive\r\n
+strict-transport-security: max-age=63072000\r\n
+vary: Cookie, Accept-Encoding\r\n
+content-length: 6502\r\n
+x-xss-protection: 1; mode=block\r\n</code>
+</pre>
+
+<p>每一行通过\r\n来进行分割。</p>
+
+<h2 id="例子">例子</h2>
+
+<pre><code>var request = new XMLHttpRequest();
+request.open("GET", "foo.txt", true);
+request.send();
+
+request.onreadystatechange = function() {
+  if(this.readyState == this.HEADERS_RECEIVED) {
+
+    // Get the raw header string
+    var headers = request.getAllResponseHeaders();
+
+    // Convert the header string into an array
+    // of individual headers
+    var arr = headers.trim().split(/[\r\n]+/);
+
+    // Create a map of header names to values
+    var headerMap = {};
+    arr.forEach(function (line) {
+      var parts = line.split(': ');
+      var header = parts.shift();
+      var value = parts.join(': ');
+      headerMap[header] = value;
+    });
+  }
+</code>
+</pre>
+
+<p>上面的代码执行后，你可以：</p>
+
+<pre><code>var contentType = headerMap["content-type"];</code>
+</pre>
+
+<p>上面的变量contentType可以获取到http header里的content-type字段值。</p>
+
+<p> </p>
+
+<p> </p>
+
+<p> </p>
+
+<p> </p>
+
+<p> </p>