gecko-dev/netwerk/test/unit/test_bug659569.js

const {HttpServer} = ChromeUtils.import("resource://testing-common/httpd.js");

var httpserver = new HttpServer();

function setupChannel(suffix)
{
  return NetUtil.newChannel({
    uri: "http://localhost:" + httpserver.identity.primaryPort + suffix,
    loadUsingSystemPrincipal: true
  });
}

function checkValueAndTrigger(request, data, ctx)
{
    Assert.equal("Ok", data);
    httpserver.stop(do_test_finished);
}

function run_test()
{
    // We don't want to have CookieSettings blocking this test.
    Services.prefs.setBoolPref("network.cookieSettings.unblocked_for_testing", true);

    // Allow all cookies.
    Services.prefs.setIntPref("network.cookie.cookieBehavior", 0);

    httpserver.registerPathHandler("/redirect1", redirectHandler1);
    httpserver.registerPathHandler("/redirect2", redirectHandler2);
    httpserver.start(-1);

    // clear cache
    evict_cache_entries();

    // load first time
    var channel = setupChannel("/redirect1");
    channel.asyncOpen(new ChannelListener(checkValueAndTrigger, null));
    do_test_pending();
}

function redirectHandler1(metadata, response)
{
	if (!metadata.hasHeader("Cookie")) {
	    response.setStatusLine(metadata.httpVersion, 302, "Found");
	    response.setHeader("Cache-Control", "max-age=600", false);
	    response.setHeader("Location", "/redirect2?query", false);
	    response.setHeader("Set-Cookie", "MyCookie=1", false);
    } else {
	    response.setStatusLine(metadata.httpVersion, 200, "Ok");
        response.setHeader("Content-Type", "text/plain");
        response.bodyOutputStream.write("Ok", "Ok".length);
    }
}

function redirectHandler2(metadata, response)
{
    response.setStatusLine(metadata.httpVersion, 302, "Found");
    response.setHeader("Location", "/redirect1", false);
}