code: def init_app(_):
      """Initialize authentication backend."""
  
imports: from __future__ import annotations
  from functools import wraps
  from typing import Any, Callable, TypeVar, cast
  from flask import Response
  from airflow.www.extensions.init_auth_manager import get_auth_manager
label_desc: Use image node_id 1 for calling a global function with example usage: init_app(_) without return types