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+---
+title: 'CSP: connect-src'
+slug: Web/HTTP/Headers/Content-Security-Policy/connect-src
+translation_of: Web/HTTP/Headers/Content-Security-Policy/connect-src
+---
+<div>{{HTTPSidebar}}</div>
+
+<p>HTTP协议头部{{HTTPHeader("Content-Security-Policy")}} (CSP)的<code><strong>connect</strong></code><strong><code>-src</code></strong> 指令用于控制允许通过脚本接口加载的链接地址。其中受到影响的API如下: </p>
+
+<ul>
+ <li>{{HTMLElement("a")}} {{htmlattrxref("ping", "a")}},</li>
+ <li>{{domxref("Fetch")}},</li>
+ <li>{{domxref("XMLHttpRequest")}},</li>
+ <li>{{domxref("WebSocket")}}, and</li>
+ <li>{{domxref("EventSource")}}.</li>
+</ul>
+
+<table class="properties">
+ <tbody>
+  <tr>
+   <th scope="row">CSP version</th>
+   <td>1</td>
+  </tr>
+  <tr>
+   <th scope="row">Directive type</th>
+   <td>{{Glossary("Fetch directive")}}</td>
+  </tr>
+  <tr>
+   <th scope="row">{{CSP("default-src")}} fallback</th>
+   <td>Yes. If this directive is absent, the user agent will look for the <code>default-src</code> directive.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Syntax">Syntax</h2>
+
+<p>connect-src 可以设置一个或者多个源地址: </p>
+
+<pre class="syntaxbox">Content-Security-Policy: connect-src &lt;source&gt;;
+Content-Security-Policy: connect-src &lt;source&gt; &lt;source&gt;;
+</pre>
+
+<h3 id="Sources">Sources</h3>
+
+<p>{{page("/Web/HTTP/Headers/Content-Security-Policy/default-src", "Sources")}}</p>
+
+<h2 id="Examples">Examples</h2>
+
+<h3 id="Violation_cases">Violation cases</h3>
+
+<p>给定如下CSP头部: </p>
+
+<pre class="brush: bash">Content-Security-Policy: connect-src https://example.com/</pre>
+
+<p>如下的连接请求会被阻塞且不会加载: </p>
+
+<pre class="brush: html">&lt;a ping="https://not-example.com"&gt;
+
+&lt;script&gt;
+  var xhr = new XMLHttpRequest();
+  xhr.open('GET', 'https://not-example.com/');
+  xhr.send();
+
+  var ws = new WebSocket("https://not-example.com/");
+
+  var es = new EventSource("https://not-example.com/");
+
+  navigator.sendBeacon("https://not-example.com/", { ... });
+&lt;/script&gt;</pre>
+
+<h2 id="Specifications">Specifications</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("CSP 3.0", "#directive-connect-src", "connect-src")}}</td>
+   <td>{{Spec2('CSP 3.0')}}</td>
+   <td>No changes.</td>
+  </tr>
+  <tr>
+   <td>{{specName("CSP 1.1", "#directive-connect-src", "connect-src")}}</td>
+   <td>{{Spec2('CSP 1.1')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</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.csp.connect-src")}}</p>
+
+<h2 id="Compatibility_notes">Compatibility notes</h2>
+
+<ul>
+ <li>Prior to Firefox 23, <code>xhr-src</code> was used in place of the <code>connect-src</code> directive and only restricted the use of {{domxref("XMLHttpRequest")}}.</li>
+</ul>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li>{{HTTPHeader("Content-Security-Policy")}}</li>
+ <li>{{HTMLElement("a")}} {{htmlattrxref("ping", "a")}}</li>
+ <li>{{domxref("Fetch")}}</li>
+ <li>{{domxref("XMLHttpRequest")}}</li>
+ <li>{{domxref("WebSocket")}}</li>
+ <li>{{domxref("EventSource")}}</li>
+</ul>