How to use the libmozevent.web.WebServer function in libmozevent

publish = taskcluster_config.secrets["PHABRICATOR"].get("publish", False)

        # Check the redis support is enabled on Heroku
        if heroku.in_dyno():
            assert self.bus.redis_enabled is True, "Need Redis on Heroku"

        community_config = taskcluster_config.secrets.get("taskcluster_community")
        test_selection_enabled = taskcluster_config.secrets.get(
            "test_selection_enabled", False
        )

        # Run webserver & pulse on web dyno or single instance
        if not heroku.in_dyno() or heroku.in_web_dyno():

            # Create web server
            self.webserver = WebServer(QUEUE_WEB_BUILDS)
            self.webserver.register(self.bus)

            # Create pulse listener
            exchanges = {}
            if taskcluster_config.secrets["autoland_enabled"]:
                logger.info("Autoland ingestion is enabled")
                # autoland ingestion
                exchanges[QUEUE_PULSE_AUTOLAND] = [
                    (PULSE_TASK_GROUP_RESOLVED, ["#.gecko-level-3.#"])
                ]

            # Create pulse listeners for bugbug test selection task and unit test failures.
            if community_config is not None and test_selection_enabled:
                exchanges[QUEUE_PULSE_TRY_TASK_END] = [
                    (PULSE_TASK_COMPLETED, ["#.gecko-level-1.#"]),
                    (PULSE_TASK_FAILED, ["#.gecko-level-1.#"]),