Async
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When Async Is Worth It in FastAPI and When Plain def Is Fine
Choose async def or def per endpoint. Learn how FastAPI threadpools sync routes, how blocking calls freeze the event loop, and when async pays off.
5 min read
Fix Async SQLAlchemy MissingGreenlet and Lazy-Loading Errors in FastAPI
MissingGreenlet means a lazy load fired outside the async context. Fix it with eager loading, expire_on_commit=False and explicit Pydantic response models.
5 min read