FastAPI app uvicorn development server path operation path parameter query parameter request body Pydantic model response model status code response headers

field constraints optional fields nested models list validation custom validator model validator query constraints path constraints header parameters cookie parameters

Depends basics dependency with parameters class dependency sub-dependencies dependency caching yield dependency database session dependency authentication dependency router dependencies global dependencies

APIRouter router prefix router tags JSONResponse RedirectResponse FileResponse StreamingResponse custom response class exception handler HTTPException

OAuth2PasswordBearer OAuth2 password flow JWT creation JWT validation password hashing scopes CORS middleware API key header cookie auth concepts secret configuration

async endpoint sync endpoint behavior background tasks WebSocket endpoint lifespan context file upload form data external API with httpx async database query task cancellation

TestClient dependency override async test request validation test auth test WebSocket test mock external API startup lifespan test response schema test error handler test

OpenAPI customization docs URLs logging trusted hosts HTTPS redirect workers health endpoint readiness endpoint database pool deployment checklist