Why might an API ignore unknown fields specified in a sparse fieldsets request like /posts?fields[posts]=id,title,unknownField?

hard📝 Conceptual Q10 of 15

Rest API - Advanced Patterns

Why might an API ignore unknown fields specified in a sparse fieldsets request like /posts?fields[posts]=id,title,unknownField?

ATo maintain backward compatibility and avoid errors

BBecause the API always returns all fields regardless

CBecause unknown fields cause the API to fail

DBecause sparse fieldsets only accept one field at a time

Step-by-Step Solution

Solution:

Step 1: Understand API behavior with unknown fields
APIs often ignore unknown fields to avoid breaking clients and maintain compatibility.
Step 2: Identify correct reason
This prevents errors and allows clients to request fields safely even if some are unsupported.
Final Answer:
To maintain backward compatibility and avoid errors -> Option A
Quick Check:
Unknown fields ignored for compatibility = To maintain backward compatibility and avoid errors [OK]

Quick Trick: APIs ignore unknown fields to avoid breaking clients [OK]

Common Mistakes:

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