Identify Ways to Optimize API Usage Through HTTP Cache Controls 350-901 Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   Which Cache-Control directive allows a response to be cached by any cache, including shared caches like CDNs, and specifies that the response is not specific to a single user?

   • Ano-cache
   • Bprivate
   • Cpublic
   • Dmax-age
   Reveal Solution Discussion Select an answer first
2. 12expert · hard

   A company's API serves a list of product offers. The offers change at unpredictable times, and the company wants to minimize the delay between an offer change and clients seeing the update. They also want to reduce server load. They currently use Cache-Control: public, max-age=3600. What is the best approach to achieve both goals?

   • ASet Cache-Control: no-store and have clients always fetch fresh data
   • BKeep max-age=3600 and use a new URL for each offer change
   • CReduce max-age to 60 seconds and use ETag for revalidation
   • DSet Cache-Control: public, max-age=0 and rely on Last-Modified
   Reveal Solution Discussion Select an answer first
4. 13application · medium

   A mobile app fetches a user's profile from a REST API. The profile data changes rarely, but the app wants to ensure it always shows the latest version when it changes. The API currently returns the profile with a Last-Modified header. What should the client do on subsequent requests to avoid downloading the full profile if it hasn't changed?

   • ASend an If-None-Match header with the Last-Modified value
   • BSend a GET request with a timestamp query parameter
   • CSend an If-Modified-Since header with the Last-Modified value
   • DSend a Cache-Control: no-cache header in the request
   Reveal Solution Discussion Select an answer first
5. 14foundation · easy

   A developer updates a JavaScript file and wants to force browsers to fetch the new version instead of using a cached copy. Which technique is an explicit cache-busting method?

   • AChanging the file's content without changing its URL
   • BSetting Cache-Control: max-age=0
   • CRemoving the Last-Modified header
   • DAppending a query string with a unique version number, e.g., app.js?v=2
   Reveal Solution Discussion Select an answer first
6. 15application · medium

   An API returns a resource that changes frequently, but the server wants to allow clients to cache the response for a short time to reduce load. However, the server also needs to ensure that clients always revalidate with the server before using a cached copy. Which Cache-Control directive should be used?

   • ACache-Control: no-store
   • BCache-Control: private, max-age=60
   • CCache-Control: public, max-age=60
   • DCache-Control: no-cache, max-age=60
   Reveal Solution Discussion Select an answer first