5 / 5 HTTP Caching & Client Layers

Reusable For A Stranger

Six responses arrive at a shared CDN cache. For each one, ask whether the cache may serve the stored copy to a different user without first contacting the origin. More than one qualifies: select every response that may be reused this way.

A

Cache-Control: max-age=600 together with Vary: *, stored 10 seconds ago

B

Cache-Control: no-cache, max-age=600, stored 10 seconds ago

C

Cache-Control: max-age=600, must-revalidate, stored 200 seconds ago

D

A response to a request that carried Authorization: Bearer eyJ..., answered with Cache-Control: public, max-age=300

E

Cache-Control: max-age=0, s-maxage=600, stored 90 seconds ago

F

Cache-Control: private, max-age=600, stored 10 seconds ago