You want to implement validation-based caching in your REST API. Which sequence correctly describes the interaction between client and server?

hard📝 Application Q15 of 15

Rest API - Caching Strategies

AClient sends request with If-None-Match header; server replies 304 if data unchanged or 200 with new data and ETag if changed

BServer sends ETag in request; client replies 304 if data unchanged or 200 with new data if changed

CClient sends ETag in response; server sends If-None-Match header to validate cache

DServer always sends 200 OK with data and never uses ETag

Step-by-Step Solution

Solution:

Step 1: Identify correct client-server header roles
Client sends If-None-Match with ETag to ask if data changed.
Step 2: Understand server response logic
Server replies 304 if data unchanged, or 200 with new data and new ETag if changed.
Final Answer:
Client sends request with If-None-Match header; server replies 304 if data unchanged or 200 with new data and ETag if changed -> Option A
Quick Check:
Client sends If-None-Match; server replies 304 or 200 [OK]

Quick Trick: Client sends If-None-Match; server replies 304 or 200 with ETag [OK]

Common Mistakes:

MISTAKES

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