code: def _forbidden():
      return Response("Forbidden", 403)
  
file_path: airflow/airflow/api/auth/backend/kerberos_auth.py
imports: from __future__ import annotations
  import warnings
  from airflow.exceptions import RemovedInAirflow3Warning
  from airflow.utils.airflow_flask_app import get_airflow_app
  import logging
  import os
  from functools import wraps
  from typing import TYPE_CHECKING, Any, Callable, TypeVar, cast
  import kerberos
  from flask import Response, _request_ctx_stack, g, make_response, request
  from requests_kerberos import HTTPKerberosAuth
  from airflow.configuration import conf
  from airflow.utils.net import getfqdn
label_desc: Use image node_id 3 for calling a global function with example usage: _forbidden() and returns: Response