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Which HTTP status code is most appropriate to include in an error response when a client sends a request with missing required data?

easy📝 Conceptual Q2 of 15
Rest API - Error Handling
Which HTTP status code is most appropriate to include in an error response when a client sends a request with missing required data?
A200 OK
B400 Bad Request
C404 Not Found
D500 Internal Server Error
Step-by-Step Solution
Solution:
  1. Step 1: Identify the meaning of HTTP status codes

    400 Bad Request means the client sent invalid or incomplete data.
  2. Step 2: Compare with other codes

    200 means success, 404 means resource missing, 500 means server error.
  3. Final Answer:

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

    Missing data error code = 400 Bad Request [OK]
Quick Trick: Use 400 for client errors like missing or invalid data [OK]
Common Mistakes:
  • Using 200 for error responses
  • Confusing 404 with bad request errors
  • Using 500 for client-side mistakes

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