Response caching strategies in Flask - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is response caching in Flask?

Response caching in Flask means saving the output of a web request so that future requests can be served faster without recalculating the response.

beginner

Name two common types of response caching strategies.

1. Client-side caching: The browser stores responses to reuse.<br>2. Server-side caching: The server stores responses to send quickly.

intermediate

How does Flask-Caching help with response caching?

Flask-Caching is an extension that makes it easy to store and retrieve cached responses on the server side using different backends like memory or Redis.

intermediate

What HTTP headers are important for client-side caching?

Headers like Cache-Control, Expires, and ETag tell browsers how long to keep a response and when to check for updates.

intermediate

Why should you be careful when caching dynamic content?

Because dynamic content changes often, caching it too long can show outdated information to users. You must set proper expiration or use cache invalidation.

Which Flask extension is commonly used for server-side response caching?

A Flask-Caching

B Flask-Login

C Flask-Mail

D Flask-WTF

Flask-Caching provides tools to cache responses on the server side.

What does the HTTP header Cache-Control: max-age=3600 mean?

A Cache only on the server

B Cache the response for 3600 seconds

C Do not cache the response

D Cache only on the client for 1 second

max-age=3600 tells browsers to keep the cached response for 3600 seconds (1 hour).

Which caching strategy stores responses in the user's browser?

A Database caching

B Server-side caching

C Client-side caching

D File system caching

Client-side caching means the browser saves responses to reuse later.

What is a risk of caching dynamic content too long?

A Showing outdated information

B Slower server response

C Increased bandwidth usage

D More database queries

Caching dynamic content too long can cause users to see old data.

Which HTTP header helps browsers check if cached content has changed?

A User-Agent

B Content-Type

C Authorization

D ETag

ETag is a unique identifier for a response version, helping browsers validate cache freshness.

Explain how you would implement server-side response caching in a Flask app.

Think about installing Flask-Caching and using decorators to cache views.

Describe the difference between client-side and server-side caching and when to use each.

Consider where the cached data lives and what benefits each provides.