A client sends If-Modified-Since: Wed, 10 May 2023 10:00:00 GMT but the server's resource has no Last-Modified header. What is the expected server behavior?

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Rest API - Caching Strategies

A client sends If-Modified-Since: Wed, 10 May 2023 10:00:00 GMT but the server's resource has no Last-Modified header. What is the expected server behavior?

ARespond with 304 Not Modified

BRespond with 400 Bad Request

CIgnore the header and send 200 OK with full resource

DRespond with 204 No Content

Step-by-Step Solution

Solution:

Step 1: Understand missing Last-Modified header
If the server does not provide Last-Modified, it cannot compare modification dates.
Step 2: Server response
The server ignores If-Modified-Since and sends full resource with 200 OK.
Final Answer:
Ignore the header and send 200 OK with full resource -> Option C
Quick Check:
No Last-Modified means no conditional response [OK]

Quick Trick: No Last-Modified means always send full resource [OK]

Common Mistakes:

MISTAKES

Sending 304 without Last-Modified
Responding with error status
Sending 204 No Content incorrectly

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A client sends If-Modified-Since: Wed, 10 May 2023 10:00:00 GMT but the server's resource has no Last-Modified header. What is the expected server behavior?

Step 1: Understand missing Last-Modified header

Step 2: Server response

Final Answer:

Quick Check:

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