The Tor Browser / file revision

 Cu.import("resource://testing-common/httpd.js");

 const sentCookieVal     = "foo=bar";

 const responseBody      = "response body";

 XPCOMUtils.defineLazyGetter(this, "baseURL", function() {

   return "http://localhost:" + httpServer.identity.primaryPort;

 });

 const preRedirectPath   = "/528292/pre-redirect";

 XPCOMUtils.defineLazyGetter(this, "preRedirectURL", function() {

   return baseURL + preRedirectPath;

 });

 const postRedirectPath  = "/528292/post-redirect";

 XPCOMUtils.defineLazyGetter(this, "postRedirectURL", function() {

   return baseURL + postRedirectPath;

 });

 var   httpServer        = null;

 var   receivedCookieVal = null;

 function preRedirectHandler(metadata, response)

 {

   response.setStatusLine(metadata.httpVersion, 302, "Found");

   response.setHeader("Location", postRedirectURL, false);

   return;

 }

 function postRedirectHandler(metadata, response)

 {

   receivedCookieVal = metadata.getHeader("Cookie");

   response.setHeader("Content-Type", "text/plain");

   response.bodyOutputStream.write(responseBody, responseBody.length);

 }

 function run_test()

 {

   // Start the HTTP server.

   httpServer = new HttpServer();

   httpServer.registerPathHandler(preRedirectPath, preRedirectHandler);

   httpServer.registerPathHandler(postRedirectPath, postRedirectHandler);

   httpServer.start(-1);

   // Disable third-party cookies in general.

   Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranch).

     setIntPref("network.cookie.cookieBehavior", 1);

   var ioService = Cc["@mozilla.org/network/io-service;1"].

                   getService(Ci.nsIIOService);

   // Set up a channel with forceAllowThirdPartyCookie set to true.  We'll use

   // the channel both to set a cookie (since nsICookieService::setCookieString

   // requires such a channel in order to successfully set a cookie) and then

   // to load the pre-redirect URI.

   var chan = ioService.newChannel(preRedirectURL, "", null).

              QueryInterface(Ci.nsIHttpChannel).

              QueryInterface(Ci.nsIHttpChannelInternal);

   chan.forceAllowThirdPartyCookie = true;

   // Set a cookie on one of the URIs.  It doesn't matter which one, since

   // they're both from the same host, which is enough for the cookie service

   // to send the cookie with both requests.

   var postRedirectURI = ioService.newURI(postRedirectURL, "", null);

   Cc["@mozilla.org/cookieService;1"].getService(Ci.nsICookieService).

     setCookieString(postRedirectURI, null, sentCookieVal, chan);

   // Load the pre-redirect URI.

   chan.asyncOpen(new ChannelListener(finish_test, null), null);

   do_test_pending();

 }

 function finish_test(event)

 {

   do_check_eq(receivedCookieVal, sentCookieVal);

   httpServer.stop(do_test_finished);

 }