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Which of these situations would most likely cause a 400 Bad Request response from a REST API?

easy📝 Conceptual Q2 of 15
Rest API - HTTP Status Codes

Which of these situations would most likely cause a 400 Bad Request response from a REST API?

ASending a JSON body with missing required fields
BRequesting a resource that does not exist
CUsing an expired authentication token
DServer experiencing high load and timing out
Step-by-Step Solution
Solution:
  1. Step 1: Identify causes of 400 Bad Request

    Missing required fields in the request body means the client sent invalid data.
  2. Step 2: Differentiate from other errors

    Requesting a missing resource causes 404, expired token causes 401, server load causes 503.
  3. Final Answer:

    Sending a JSON body with missing required fields -> Option A
  4. Quick Check:

    Missing fields = 400 Bad Request [OK]
Quick Trick: Missing or wrong data triggers 400 Bad Request [OK]
Common Mistakes:
  • Mixing 400 with 404 Not Found
  • Confusing authentication errors with 400
  • Thinking server issues cause 400

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