[Solved] What does the If-None-Match header do in a REST API request? — Ans: It asks the server to send data only if it has changed since the last request. | Rest API

Rest API - Caching Strategies

What does the If-None-Match header do in a REST API request?

AIt asks the server to send data only if it has changed since the last request.

BIt forces the server to ignore caching and send fresh data every time.

CIt tells the server to delete the cached data on the client side.

DIt requests the server to send the full data regardless of changes.

Step-by-Step Solution

Solution:

Step 1: Understand the purpose of If-None-Match
This header sends the ETag value from the client to check if the resource has changed.
Step 2: Determine the server's response based on the ETag
If the ETag matches, the server returns 304 Not Modified, meaning no new data is sent.
Final Answer:
It asks the server to send data only if it has changed since the last request. -> Option A
Quick Check:
If-None-Match checks changes [OK]

Quick Trick: If-None-Match checks if data changed before sending [OK]

Common Mistakes:

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