A client sends If-Modified-Since: Tue, 09 May 2023 10:00:00 GMT but the server always responds with HTTP 200 OK and full data, ignoring the header. What is the likely error in server handling?

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Rest API - Caching Strategies

A client sends If-Modified-Since: Tue, 09 May 2023 10:00:00 GMT but the server always responds with HTTP 200 OK and full data, ignoring the header. What is the likely error in server handling?

AServer does not check If-Modified-Since header before sending data

BServer sends wrong Last-Modified date format

CClient sent If-Modified-Since header incorrectly

DServer is missing Content-Type header

Step-by-Step Solution

Solution:

Step 1: Understand expected server behavior
The server should compare If-Modified-Since with resource's Last-Modified and respond 304 if not changed.
Step 2: Identify why server always sends 200 OK
If server ignores the header and always sends full data, it likely does not check the If-Modified-Since header properly.
Final Answer:
Server does not check If-Modified-Since header before sending data -> Option A
Quick Check:
Ignoring If-Modified-Since means always 200 OK [OK]

Quick Trick: Server must check If-Modified-Since to send 304 [OK]

Common Mistakes:

MISTAKES

Blaming client for server ignoring header
Thinking wrong Last-Modified format causes 200 OK
Confusing Content-Type header with caching headers

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A client sends If-Modified-Since: Tue, 09 May 2023 10:00:00 GMT but the server always responds with HTTP 200 OK and full data, ignoring the header. What is the likely error in server handling?

Step 1: Understand expected server behavior

Step 2: Identify why server always sends 200 OK

Final Answer:

Quick Check:

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