[Solved] How can you combine Last-Modified with ETag headers to improve cache validation in a REST API? — Ans: Use Last-Modified for date checks and ETag for content hash validation. | Rest API

Rest API - Caching Strategies

How can you combine Last-Modified with ETag headers to improve cache validation in a REST API?

ASend both headers but never check If-None-Match or If-Modified-Since.

BUse only Last-Modified and ignore ETag headers.

CUse ETag as a replacement for Last-Modified date format.

DUse Last-Modified for date checks and ETag for content hash validation.

Step-by-Step Solution

Solution:

Step 1: Understand header roles
Last-Modified provides a timestamp, ETag provides a unique content identifier (hash).
Step 2: Combine for better validation
Clients can use If-Modified-Since and If-None-Match to validate cache more precisely.
Final Answer:
Use Last-Modified for date checks and ETag for content hash validation. -> Option D
Quick Check:
Last-Modified + ETag = stronger cache validation [OK]

Quick Trick: Combine Last-Modified date and ETag hash for caching [OK]

Common Mistakes:

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How can you combine Last-Modified with ETag headers to improve cache validation in a REST API?