If a client sends an If-None-Match header with a value that does NOT match the current ETag on the server, what will the server typically respond with?

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Rest API - Caching Strategies

If a client sends an If-None-Match header with a value that does NOT match the current ETag on the server, what will the server typically respond with?

A304 Not Modified

B200 OK with the resource data

C403 Forbidden

D301 Moved Permanently

Step-by-Step Solution

Solution:

Step 1: Understand non-matching ETag meaning
If the ETag in If-None-Match does not match, the resource has changed.
Step 2: Identify server response for changed resource
The server sends the updated resource with status 200 OK.
Final Answer:
200 OK with the resource data -> Option B
Quick Check:
Non-matching ETag response = 200 OK with data [OK]

Quick Trick: Non-matching ETag returns 200 OK with data [OK]

Common Mistakes:

MISTAKES

Returning 304 when ETags differ
Confusing 403 or 301 with caching behavior
Assuming no response body on mismatch

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If a client sends an If-None-Match header with a value that does NOT match the current ETag on the server, what will the server typically respond with?

Step 1: Understand non-matching ETag meaning

Step 2: Identify server response for changed resource

Final Answer:

Quick Check:

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