Can I return a 204 No Content?

Yes! 204 is perfect for DELETE requests where you successfully deleted the resource but have no data to send back. Just use `status_code=status.HTTP_204_NO_CONTENT`. Note: A 204 response MUST NOT have a response body.

Where do I get the `status` object?

You import it via `from fastapi import status`. It's a convenience object containing autocomplete-friendly variables like `status.HTTP_404_NOT_FOUND`, so you don't have to memorize numerical codes.

Can I add custom headers to an HTTPException?

Absolutely. You can raise it like this: `raise HTTPException(status_code=401, detail="Unauth", headers={"WWW-Authenticate": "Bearer"})`. This is crucial for proper OAuth2 implementations.

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HTTP Semantics & Errors

Master HTTP semantics in FastAPI. Learn how to explicitly define success codes, gracefully interrupt execution by raising HTTPExceptions, and differentiate between client (4xx) and server (5xx) errors.

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