You want to optimize a REST API to reduce bandwidth by sending full data only when it changes. Which combination of headers should you use in the response?

hard📝 Application Q15 of 15

Rest API - Request and Response Format

ACache-Control: max-age=0 and no ETag

BCache-Control: no-cache and ETag with unique value

CCache-Control: no-store and no ETag

DCache-Control: max-age=3600 and no ETag

Step-by-Step Solution

Solution:

Step 1: Identify headers that enable conditional requests
ETag provides a unique identifier for content versions, allowing clients to ask if content changed.
Step 2: Understand Cache-Control no-cache directive
no-cache forces the browser to validate with the server before using cached data, ensuring fresh content without unnecessary full data transfer.
Step 3: Evaluate other options
Options without ETag cannot validate changes efficiently; no-store disables caching; max-age=0 without ETag disables validation.
Final Answer:
Cache-Control: no-cache and ETag with unique value -> Option B
Quick Check:
no-cache + ETag = bandwidth saving [OK]

Quick Trick: Use no-cache with ETag for efficient validation [OK]

Common Mistakes:

MISTAKES

Omitting ETag disables change detection
Using no-store disables caching entirely
Assuming max-age alone reduces bandwidth

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More Rest API Quizzes

You want to optimize a REST API to reduce bandwidth by sending full data only when it changes. Which combination of headers should you use in the response?

Step 1: Identify headers that enable conditional requests

Step 2: Understand Cache-Control no-cache directive

Step 3: Evaluate other options

Final Answer:

Quick Check:

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