Rest API - Caching Strategies
To perform a conditional GET request that uses an ETag to check if the resource has changed, which HTTP header must the client send?
To perform a conditional GET request that uses an ETag to check if the resource has changed, which HTTP header must the client send?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Understand conditional GET
A conditional GET request asks the server to send the resource only if it has changed.Step 2: Identify the correct header
TheIf-None-Matchheader is used by the client to provide the ETag value it has, so the server can compare and decide if the resource has changed.Final Answer:
If-None-Match -> Option DQuick Check:
Conditional GET usesIf-None-Matchheader [OK]
Quick Trick: Use If-None-Match header for conditional GET with ETag [OK]
Common Mistakes:
MISTAKES- Confusing If-Match with If-None-Match
- Sending ETag header in request instead of response
- Using If-Modified-Since instead of ETag-based header
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