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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=682305
+-->
+<head>
+  <title>XMLHttpRequest send and channel implemented in JS</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript"  src="chrome://mochikit/content/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank"
+   href="https://bugzilla.mozilla.org/show_bug.cgi?id=682305">Mozilla Bug 682305</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script class="testbody" type="application/javascript">
+
+"use strict";
+
+SimpleTest.waitForExplicitFinish();
+
+/*
+ * Register a custom nsIProtocolHandler service
+ * in order to be able to implement *and use* an
+ * nsIChannel component written in Javascript.
+ */
+
+const { ComponentUtils } = ChromeUtils.importESModule(
+  "resource://gre/modules/ComponentUtils.sys.mjs"
+);
+
+var contentSecManager = Cc["@mozilla.org/contentsecuritymanager;1"]
+                          .getService(Ci.nsIContentSecurityManager);
+
+var PROTOCOL_SCHEME = "jsproto";
+
+
+function CustomChannel(uri, loadInfo) {
+  this.URI = this.originalURI = uri;
+  this.loadInfo = loadInfo;
+}
+CustomChannel.prototype = {
+  URI: null,
+  originalURI: null,
+  loadInfo: null,
+  contentCharset: "utf-8",
+  contentLength: 0,
+  contentType: "text/plain",
+  owner: Cc["@mozilla.org/systemprincipal;1"].createInstance(Ci.nsIPrincipal),
+  securityInfo: null,
+  notificationCallbacks: null,
+  loadFlags: 0,
+  loadGroup: null,
+  name: null,
+  status: Cr.NS_OK,
+  asyncOpen(listener) {
+    // throws an error if security checks fail
+    var outListener = contentSecManager.performSecurityCheck(this, listener);
+    let stream = this.open();
+    try {
+      outListener.onStartRequest(this);
+    } catch (e) {}
+    try {
+      outListener.onDataAvailable(this, stream, 0, stream.available());
+    } catch (e) {}
+    try {
+      outListener.onStopRequest(this, Cr.NS_OK);
+    } catch (e) {}
+  },
+  open() {
+    // throws an error if security checks fail
+    contentSecManager.performSecurityCheck(this, null);
+
+    let data = "bar";
+    let stream = Cc["@mozilla.org/io/string-input-stream;1"].createInstance(Ci.nsIStringInputStream);
+    stream.setData(data, data.length);
+    return stream;
+  },
+  isPending() {
+    return false;
+  },
+  cancel() {
+    throw Components.Exception("", Cr.NS_ERROR_NOT_IMPLEMENTED);
+  },
+  suspend() {
+    throw Components.Exception("", Cr.NS_ERROR_NOT_IMPLEMENTED);
+  },
+  resume() {
+    throw Components.Exception("", Cr.NS_ERROR_NOT_IMPLEMENTED);
+  },
+  QueryInterface: ChromeUtils.generateQI(["nsIChannel", "nsIRequest"]),
+};
+
+
+function CustomProtocol() {}
+CustomProtocol.prototype = {
+  get scheme() {
+    return PROTOCOL_SCHEME;
+  },
+  allowPort: function allowPort() {
+    return false;
+  },
+  newChannel: function newChannel(URI, loadInfo) {
+    return new CustomChannel(URI, loadInfo);
+  },
+  QueryInterface: ChromeUtils.generateQI(["nsISupportsWeakReference", "nsIProtocolHandler"]),
+};
+
+var gFactory = {
+  register() {
+    Services.io.registerProtocolHandler(
+      PROTOCOL_SCHEME,
+      new CustomProtocol(),
+      Ci.nsIProtocolHandler.URI_NORELATIVE |
+        Ci.nsIProtocolHandler.URI_IS_LOCAL_RESOURCE |
+        Ci.nsIProtocolHandler.URI_DANGEROUS_TO_LOAD,
+      -1
+    );
+
+    this.unregister = function() {
+      Services.io.unregisterProtocolHandler(PROTOCOL_SCHEME);
+      delete this.unregister;
+    };
+  },
+};
+
+// Register the custom procotol handler
+gFactory.register();
+
+// Then, checks if XHR works with it
+var xhr = new XMLHttpRequest();
+xhr.open("GET", PROTOCOL_SCHEME + ":foo", true);
+xhr.onload = function() {
+  is(xhr.responseText, "bar", "protocol doesn't work");
+  gFactory.unregister();
+  SimpleTest.finish();
+};
+try {
+  xhr.send(null);
+} catch (e) {
+  ok(false, e);
+}
+</script>
+</pre>
+</body>
+</html>