A client sends a request with header If-Modified-Since: Wed, 10 May 2023 10:00:00 GMT. The server's resource was last modified at Wed, 10 May 2023 09:00:00 GMT. What will the server respond?

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Rest API - Caching Strategies

A client sends a request with header If-Modified-Since: Wed, 10 May 2023 10:00:00 GMT. The server's resource was last modified at Wed, 10 May 2023 09:00:00 GMT. What will the server respond?

A304 Not Modified with no body

B200 OK with full resource

C404 Not Found

D500 Internal Server Error

Step-by-Step Solution

Solution:

Step 1: Compare modification dates
The resource was last modified before the date in If-Modified-Since header.
Step 2: Determine server response
Since resource is not modified after the date, server responds with 304 Not Modified and no body.
Final Answer:
304 Not Modified with no body -> Option A
Quick Check:
Resource older than If-Modified-Since = 304 [OK]

Quick Trick: If resource older than date, respond 304 [OK]

Common Mistakes:

MISTAKES

Sending full resource when not modified
Confusing 404 with modification status
Assuming server error on date mismatch

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A client sends a request with header If-Modified-Since: Wed, 10 May 2023 10:00:00 GMT. The server's resource was last modified at Wed, 10 May 2023 09:00:00 GMT. What will the server respond?

Step 1: Compare modification dates

Step 2: Determine server response

Final Answer:

Quick Check:

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