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A batch update request fails with a 400 Bad Request error. What is a likely cause?

medium📝 Debug Q6 of 15
Rest API - Batch and Bulk Operations
A batch update request fails with a 400 Bad Request error. What is a likely cause?
AServer successfully processed all updates
BThe client sent an empty array
CRequest used the GET method instead of PATCH
DMalformed JSON payload in the request body
Step-by-Step Solution
Solution:

  1. Step 1: Identify causes of 400 Bad Request

    400 error means client sent invalid or malformed data.

  2. Step 2: Match cause to batch update failure

    Malformed JSON payload is a common reason for 400 errors in batch updates.

  3. Final Answer:

    Malformed JSON payload in the request body -> Option D

  4. Quick Check:

    400 error cause = malformed JSON [OK]
Quick Trick: Check JSON syntax if 400 error occurs [OK]
Common Mistakes:
MISTAKES
  • Assuming 400 means success
  • Confusing HTTP methods without checking payload
  • Ignoring empty payload as valid

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