diff -r 000000000000 -r 6474c204b198 netwerk/test/unit/test_bug669001.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/netwerk/test/unit/test_bug669001.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,161 @@
+Cu.import("resource://testing-common/httpd.js");
+
+var httpServer = null;
+var path = "/bug699001";
+
+XPCOMUtils.defineLazyGetter(this, "URI", function() {
+  return "http://localhost:" + httpServer.identity.primaryPort + path;
+});
+
+function make_channel(url) {
+  var ios = Cc["@mozilla.org/network/io-service;1"].
+            getService(Ci.nsIIOService);
+  return ios.newChannel(url, "", null);
+}
+
+var fetched;
+
+// The test loads a resource that expires in one year, has an etag and varies only by User-Agent
+// First we load it, then check we load it only from the cache w/o even checking with the server
+// Then we modify our User-Agent and try it again
+// We have to get a new content (even though with the same etag) and again on next load only from
+// cache w/o accessing the server
+// Goal is to check we've updated User-Agent request header in cache after we've got 304 response
+// from the server
+
+var tests = [
+{
+  prepare: function() { },
+  test: function(response) {
+    do_check_true(fetched);
+  }
+},
+{
+  prepare: function() { },
+  test: function(response) {
+    do_check_false(fetched);
+  }
+},
+{
+  prepare: function() {
+    setUA("A different User Agent");
+  },
+  test: function(response) {
+    do_check_true(fetched);
+  }
+},
+{
+  prepare: function() { },
+  test: function(response) {
+    do_check_false(fetched);
+  }
+},
+{
+  prepare: function() {
+    setUA("And another User Agent");
+  },
+  test: function(response) {
+    do_check_true(fetched);
+  }
+},
+{
+  prepare: function() { },
+  test: function(response) {
+    do_check_false(fetched);
+  }
+}
+];
+
+function handler(metadata, response)
+{
+  if (metadata.hasHeader("If-None-Match")) {
+    response.setStatusLine(metadata.httpVersion, 304, "Not modified");
+  }
+  else {
+    response.setStatusLine(metadata.httpVersion, 200, "OK");
+    response.setHeader("Content-Type", "text/plain");
+
+    var body = "body";
+    response.bodyOutputStream.write(body, body.length);
+  }
+
+  fetched = true;
+
+  response.setHeader("Expires", getDateString(+1));
+  response.setHeader("Cache-Control", "private");
+  response.setHeader("Vary", "User-Agent");
+  response.setHeader("ETag", "1234");
+}
+
+function run_test()
+{
+  httpServer = new HttpServer();
+  httpServer.registerPathHandler(path, handler);
+  httpServer.start(-1);
+
+  do_test_pending();
+
+  nextTest();
+}
+
+function nextTest()
+{
+  fetched = false;
+  tests[0].prepare();
+
+  dump("Testing with User-Agent: " + getUA() + "\n");
+  var chan = make_channel(URI);
+
+  // Give the old channel a chance to close the cache entry first.
+  // XXX This is actually a race condition that might be considered a bug...
+  do_execute_soon(function() {
+    chan.asyncOpen(new ChannelListener(checkAndShiftTest, null), null);
+  });
+}
+
+function checkAndShiftTest(request, response)
+{
+  tests[0].test(response);
+
+  tests.shift();
+  if (tests.length == 0) {
+    httpServer.stop(tearDown);
+    return;
+  }
+
+  nextTest();
+}
+
+function tearDown()
+{
+  setUA("");
+  do_test_finished();
+}
+
+// Helpers
+
+function getUA()
+{
+  var httphandler = Cc["@mozilla.org/network/protocol;1?name=http"].
+                 getService(Ci.nsIHttpProtocolHandler);
+  return httphandler.userAgent;
+}
+
+function setUA(value)
+{
+  var prefs = Cc["@mozilla.org/preferences-service;1"].
+                 getService(Ci.nsIPrefBranch);
+  prefs.setCharPref("general.useragent.override", value);
+}
+
+function getDateString(yearDelta) {
+  var months = [ 'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug',
+          'Sep', 'Oct', 'Nov', 'Dec' ];
+  var days = [ 'Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat' ];
+
+  var d = new Date();
+  return days[d.getUTCDay()] + ", " + d.getUTCDate() + " "
+          + months[d.getUTCMonth()] + " " + (d.getUTCFullYear() + yearDelta)
+          + " " + d.getUTCHours() + ":" + d.getUTCMinutes() + ":"
+          + d.getUTCSeconds() + " UTC";
+}