Identify Ways to Optimize API Usage Through HTTP Cache Controls 350-901 Practice Questions (Page 5)

Questions 21–23

1. 21foundation · easy

   An API developer changes the response format for an endpoint and wants to ensure clients do not receive stale cached responses. Which technique is a common way to invalidate cached API responses?

   • AAdding a Cache-Control: public directive
   • BChanging the API version in the URL path, e.g., /v2/resource
   • CIncreasing the max-age directive on the response
   • DRemoving the ETag header from the response
   Reveal Solution Discussion Select an answer first
2. 22expert · medium

   A client receives a response with the following headers: Cache-Control: max-age=600, ETag: "v1", Last-Modified: Wed, 01 Jan 2025 00:00:00 GMT. After 15 minutes, the client sends a conditional request with If-None-Match: "v1" and receives a 200 OK with a new body and a new ETag: "v2". What should the client do?

   • ASend another conditional request with If-Modified-Since
   • BDiscard the new response and use the old cached copy
   • CReplace the cached copy with the new response and update the ETag to "v2"
   • DKeep the old cached copy because the max-age has not expired
   Reveal Solution Discussion Select an answer first
3. 23application · medium

   A DevOps team is designing a public REST API that returns a list of product categories. This list changes infrequently and is identical for all users. The team wants to reduce server load and latency for clients. Which HTTP response header configuration should they use?

   • ACache-Control: no-cache, max-age=3600
   • BCache-Control: private, max-age=3600
   • CCache-Control: public, max-age=3600
   • DCache-Control: no-store
   Reveal Solution Discussion Select an answer first