def METHOD_NAME(self):
    if self.server_manager:
        return
    self.server_manager = self.create_new_server_manager(self.port)
    self.server_manager.on_stop_callbacks.append(
        self.set_service_failed_icon
    )
    webserver_url = self.server_manager.url
    os.environ[self.webserver_url_env] = str(webserver_url)
    self.webserver_url = webserver_url