if not model_arg:
            self.action_url = http.param_at(url, 1) + '/' + http.param_at(url, -1)  # e.g: 'user/action_name'
        else:
            self.action_url = http.param_at(url, 1) + '/#arg/' + http.param_at(url, -1)  # e.g: 'user/123/action_name'