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"""Test using Response type hint as dependency annotation."""
from typing import Annotated
from fastapi import Depends, FastAPI, Response
from fastapi.testclient import TestClient
def test_response_with_depends_annotated():
"""Response type hint should work with Annotated[Response, Depends(...)]."""
app = FastAPI()
def modify_response(response: Response) -> Response:
response.headers["X-Custom"] = "modified"
return response
@app.get("/")
def endpoint(response: Annotated[Response, Depends(modify_response)]):
return {"status": "ok"}
client = TestClient(app)
resp = client.get("/")
assert resp.status_code == 200
assert resp.json() == {"status": "ok"}
assert resp.headers.get("X-Custom") == "modified"
def test_response_with_depends_default():
"""Response type hint should work with Response = Depends(...)."""
app = FastAPI()
def modify_response(response: Response) -> Response:
response.headers["X-Custom"] = "modified"
return response
@app.get("/")
def endpoint(response: Response = Depends(modify_response)):
return {"status": "ok"}
client = TestClient(app)
resp = client.get("/")
assert resp.status_code == 200
assert resp.json() == {"status": "ok"}
assert resp.headers.get("X-Custom") == "modified"
def test_response_without_depends():
"""Regular Response injection should still work."""
app = FastAPI()
@app.get("/")
def endpoint(response: Response):
response.headers["X-Direct"] = "set"
return {"status": "ok"}
client = TestClient(app)
resp = client.get("/")
assert resp.status_code == 200
assert resp.json() == {"status": "ok"}
assert resp.headers.get("X-Direct") == "set"
def test_response_dependency_chain():
"""Response dependency should work in a chain of dependencies."""
app = FastAPI()
def first_modifier(response: Response) -> Response:
response.headers["X-First"] = "1"
return response
def second_modifier(
response: Annotated[Response, Depends(first_modifier)],
) -> Response:
response.headers["X-Second"] = "2"
return response
@app.get("/")
def endpoint(response: Annotated[Response, Depends(second_modifier)]):
return {"status": "ok"}
client = TestClient(app)
resp = client.get("/")
assert resp.status_code == 200
assert resp.headers.get("X-First") == "1"
assert resp.headers.get("X-Second") == "2"