Expiration-based caching in Rest API - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is expiration-based caching in REST APIs?

Expiration-based caching is a technique where cached data is stored with a time limit. After this time expires, the cache is considered stale and must be refreshed from the server.

beginner

What HTTP header is commonly used to specify cache expiration time?

The Cache-Control header with directives like max-age is used to specify how long a response can be cached before it expires.

intermediate

How does the Expires header differ from Cache-Control: max-age?

Expires sets an absolute date/time when the cache expires, while Cache-Control: max-age sets a relative time in seconds from the response time.

beginner

Why is expiration-based caching useful in REST APIs?

It reduces server load and speeds up responses by reusing data for a set time, while ensuring data is refreshed regularly to stay up-to-date.

beginner

What happens when cached data expires in expiration-based caching?

When cached data expires, the client or proxy must request fresh data from the server to replace the stale cache.

Which HTTP header sets a relative expiration time for cached data?

A Cache-Control: max-age

B Expires

C Content-Type

D Authorization

Cache-Control: max-age sets the cache expiration time relative to the response time.

What does expiration-based caching help improve in REST APIs?

A Database schema design

B Security of data

C Response speed and server load

D User authentication

Expiration-based caching improves response speed and reduces server load by reusing cached data.

If a cached response has expired, what should happen next?

A Use the expired cache anyway

B Request fresh data from the server

C Delete the cache and do nothing

D Ignore the expiration and continue

Expired cache must be refreshed by requesting fresh data from the server.

Which header sets an absolute expiration date/time for cached data?

A Expires

B Cache-Control: max-age

C Content-Length

D Accept

Expires header specifies an absolute date/time when the cache expires.

What is a key benefit of using expiration-based caching?

A Prevents all caching

B Encrypts data for security

C Automatically deletes user data

D Ensures data is regularly updated while improving performance

Expiration-based caching balances performance with data freshness by updating data regularly.

Explain how expiration-based caching works in REST APIs and why it is important.

Think about how long cached data stays valid and what happens after.

Describe the difference between the HTTP headers Expires and Cache-Control: max-age.

One sets a fixed date, the other sets a time duration.