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Application Basics

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

Validation

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

Dependencies

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

Routing & Responses

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

Security

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

Async & Integration

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

Testing

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

Production

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

FastAPI / Security

CORS middleware

Learn CORS middleware in FastAPI with a dedicated explanation, a topic-specific example, edge guidance, and a mastery check.

12 min read • Intermediate

fastapi-047.py

python

app.add_middleware(CORSMiddleware,allow_origins=["https://app.example.com"],allow_credentials=True,allow_methods=["GET","POST"],allow_headers=["Authorization","Content-Type"])

What to watch

Content source & attribution

Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

CORS middleware Mastery Check →