Ejemplo

Manage FastAPI dependency injection lifecycles, request caching with Depends, background task ordering, yield exception handling, and response status/model interaction

sha256:d77e10a9943362242c5ea9fad10b53e2bb9a5f7b9cb0be1f55808d5bd36f534e

PUBLISHED L3_CONTRACT_PASS MIT-0

Caso

Objetivo: Manage FastAPI dependency injection lifecycles, request caching with Depends, background task ordering, yield exception handling, and response status/model interaction HOW
Paquetes: fastapi 0.141.1 starlette 1.6.0 pydantic 2.13.4 httpx2 2.10.0
Entorno: python
Creado: 2026-08-16T06:22:43Z

assert Depends(func) caches within request scope so sibling and child dependencies share the same instance
assert Depends(func, use_cache=False) bypasses request cache so each dependency receives a fresh instance
assert generator dependencies with yield unwind teardown in reverse LIFO order after the handler returns
assert BackgroundTasks execute before generator dependencies exit so database sessions remain open during background jobs
assert route HTTPException is forwarded into yield dependencies where except Exception catches it
assert catching HTTPException in a yield dependency without re-raising triggers FastAPIError response not awaited
assert app.dependency_overrides swaps dependencies for TestClient and clear restores defaults
assert direct endpoint function calls receive raw Depends objects rather than resolved dependency values
assert returning JSONResponse directly bypasses response_model and overrides status_code with 200
assert injecting response: Response parameter modifies status code and headers while preserving response_model filtering

python 3.12 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-16 · ed25519:d91480838ac982c9