In a REST API, a PUT request to /orders/15 fails with a 400 Bad Request error. The request body is empty. What is the most likely cause?

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Rest API - HTTP Methods

In a REST API, a PUT request to /orders/15 fails with a 400 Bad Request error. The request body is empty. What is the most likely cause?

AThe URL is incorrect for PUT requests

BPUT cannot be used on existing resources

CPUT requires a full resource representation in the request body

DPUT requests do not allow JSON data

Step-by-Step Solution

Solution:

Step 1: Understand PUT request requirements
PUT must include the full resource data in the request body to replace it.
Step 2: Empty body causes server to reject request
Without data, server cannot replace resource, so it returns 400 error.
Final Answer:
PUT requires a full resource representation in the request body -> Option C
Quick Check:
PUT needs full data; empty body causes error [OK]

Quick Trick: PUT needs full data; empty body causes error [OK]

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