You want to cache a resource publicly but ensure it is revalidated after 5 minutes. Which Cache-Control header should you use?

hard📝 Application Q8 of 15

Rest API - Caching Strategies

ACache-Control: no-store, max-age=300, public

BCache-Control: private, max-age=300, no-store

CCache-Control: public, no-cache, max-age=300

DCache-Control: public, max-age=300, must-revalidate

Step-by-Step Solution

Solution:

Step 1: Identify directives for public caching and revalidation
'public' allows shared caches, 'max-age=300' sets 5 minutes freshness, 'must-revalidate' forces revalidation after expiry.
Step 2: Eliminate incorrect options
'private' restricts caching to single user, 'no-store' disables caching, and 'no-cache' forces revalidation always, not after 5 minutes.
Final Answer:
Cache-Control: public, max-age=300, must-revalidate -> Option D
Quick Check:
public + max-age + must-revalidate = shared cache with revalidation [OK]

Quick Trick: Use 'public, max-age=seconds, must-revalidate' for shared cache with expiry [OK]

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