code: def foo_handler(
      client_key: str = Depends(_get_client_key),
      client_tag: Optional[str] = Depends(_get_client_tag),
  ):
      return {"client_id": client_key, "client_tag": client_tag}
  
file_path: fastapi/tests/test_enforce_once_required_parameter.py
imports: from typing import Optional
  from fastapi import Depends, FastAPI, Query, status
  from fastapi.testclient import TestClient
label_desc: Use image node_id 3 for calling a global function with example usage: foo_handler(client_key, client_tag) and returns: dict