gecko-dev/netwerk/test/unit/test_bug331825.js

"use strict";

const { HttpServer } = ChromeUtils.importESModule(
  "resource://testing-common/httpd.sys.mjs"
);

var server;
const BUGID = "331825";

function TestListener() {}
TestListener.prototype.onStartRequest = function () {};
TestListener.prototype.onStopRequest = function (request) {
  var channel = request.QueryInterface(Ci.nsIHttpChannel);
  Assert.equal(channel.responseStatus, 304);

  server.stop(do_test_finished);
};

function run_test() {
  // start server
  server = new HttpServer();

  server.registerPathHandler("/bug" + BUGID, bug331825);

  server.start(-1);

  // make request
  var channel = NetUtil.newChannel({
    uri: "http://localhost:" + server.identity.primaryPort + "/bug" + BUGID,
    loadUsingSystemPrincipal: true,
  });

  channel.QueryInterface(Ci.nsIHttpChannel);
  channel.setRequestHeader("If-None-Match", "foobar", false);
  channel.asyncOpen(new TestListener());

  do_test_pending();
}

// PATH HANDLER FOR /bug331825
function bug331825(metadata, response) {
  response.setStatusLine(metadata.httpVersion, 304, "Not Modified");
}