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What will happen if you raise an exception that has no registered custom handler in FastAPI?

medium🧠 Conceptual Q5 of 15
FastAPI - Error Handling
What will happen if you raise an exception that has no registered custom handler in FastAPI?
AThe request is silently ignored
BThe server crashes and stops responding
CFastAPI automatically creates a handler and returns 200 OK
DFastAPI returns a default 500 Internal Server Error response
Step-by-Step Solution
Solution:

  1. Step 1: Understand default FastAPI behavior

    If no custom handler exists, FastAPI returns a default 500 error for unhandled exceptions.

  2. Step 2: Confirm server stability

    The server does not crash; it handles the error gracefully with a 500 response.

  3. Final Answer:

    FastAPI returns a default 500 Internal Server Error response -> Option D

  4. Quick Check:

    No handler = default 500 error [OK]
Quick Trick: Unhandled exceptions return 500 error by default [OK]
Common Mistakes:
MISTAKES
  • Thinking server crashes on unhandled exceptions
  • Assuming 200 OK is returned
  • Believing requests are ignored silently

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