Rest API - Caching Strategies
Which scenario best describes the use of the
If-None-Match HTTP header in REST API requests?Which scenario best describes the use of the If-None-Match HTTP header in REST API requests?
easy📝 Conceptual Q1 of 15
Step-by-Step Solution
Solution:
Step 1: Understand
This header is used by clients to make conditional requests based on the ETag value.If-None-MatchStep 2: Purpose of the header
The client sends the ETag it has, and the server compares it with the current ETag.Step 3: Server behavior
If the ETags match, the server returns 304 Not Modified, avoiding sending the full resource again.Final Answer:
To ask the server to send the resource only if it has changed since the last request -> Option AQuick Check:
Conditional request based on ETag [OK]
Quick Trick: If-None-Match checks if resource changed before sending [OK]
Common Mistakes:
MISTAKES- Confusing If-None-Match with authentication headers
- Thinking it forces fresh data regardless of cache
- Assuming it sets content type preferences
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