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If a FastAPI app uses OAuth2 security but the token is expired, what will the API response be?

medium📝 component behavior Q5 of 15
FastAPI - Authentication and Security
If a FastAPI app uses OAuth2 security but the token is expired, what will the API response be?
A500 Internal Server Error
B401 Unauthorized error
C200 OK with data
DRedirect to homepage
Step-by-Step Solution
Solution:

  1. Step 1: Understand OAuth2 token expiration

    When a token expires, the API denies access and returns an unauthorized error.

  2. Step 2: Match response codes

    401 Unauthorized is the standard response for expired or invalid tokens.

  3. Final Answer:

    401 Unauthorized error -> Option B

  4. Quick Check:

    Expired token = 401 error [OK]
Quick Trick: Expired token causes 401 Unauthorized [OK]
Common Mistakes:
MISTAKES
  • Expecting 200 OK with expired token
  • Confusing 500 error with auth failure
  • Thinking redirect happens automatically

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