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Which HTTP status code is most appropriate to use with a human-readable error message when a client sends invalid data?

easy📝 Conceptual Q2 of 15
Rest API - Error Handling

Which HTTP status code is most appropriate to use with a human-readable error message when a client sends invalid data?

A200 OK
B400 Bad Request
C500 Internal Server Error
D302 Found
Step-by-Step Solution
Solution:
  1. Step 1: Identify status codes for client errors

    400 Bad Request indicates the client sent invalid or malformed data.
  2. Step 2: Match status code with error message purpose

    Use 400 to signal client error with a clear message explaining the problem.
  3. Final Answer:

    400 Bad Request -> Option B
  4. Quick Check:

    Invalid client data status = 400 Bad Request [OK]
Quick Trick: Use 400 for client input errors [OK]
Common Mistakes:
  • Using 200 OK for errors
  • Confusing 500 with client errors
  • Using redirect codes for errors

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