[Solved] Given this HTTP response header:Cache-Control: max-age=60 ETag: "12345"If the client sends a request with If-None-Match: "12345" after 30 seconds, what will the server most likely respond? | Rest API

Rest API - Request and Response Format

Given this HTTP response header:

Cache-Control: max-age=60
ETag: "12345"

If the client sends a request with If-None-Match: "12345" after 30 seconds, what will the server most likely respond?

AHTTP 404 Not Found

BHTTP 200 OK with full content

CHTTP 304 Not Modified

DHTTP 500 Internal Server Error

Step-by-Step Solution

Solution:

Step 1: Check cache freshness with max-age
max-age=60 means the cached content is fresh for 60 seconds; 30 seconds is within this period.
Step 2: Understand ETag and If-None-Match usage
The client sends If-None-Match with the same ETag, so the server knows the client has the latest version.
Step 3: Determine server response
Since content is fresh and unchanged, server responds with 304 Not Modified to save bandwidth.
Final Answer:
HTTP 304 Not Modified -> Option C
Quick Check:
ETag match + fresh cache = 304 Not Modified [OK]

Quick Trick: ETag match with fresh cache returns 304 Not Modified [OK]

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