Rate limiting for protection in Flask - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is rate limiting in web applications?

Rate limiting is a technique to control how many requests a user or client can make to a server in a given time. It helps protect the app from overload and abuse.

beginner

How does Flask-Limiter help in rate limiting?

Flask-Limiter is an extension that makes it easy to add rate limits to Flask routes. It tracks requests and blocks users who exceed limits.

beginner

What is a common rate limit rule format in Flask-Limiter?

A common rule looks like '5 per minute', meaning a user can make 5 requests every minute before being blocked.

intermediate

Why is rate limiting important for API endpoints?

It prevents too many requests from one user or bot, which can crash the server or cause slowdowns. It also stops abuse like brute force attacks.

intermediate

How can you customize rate limits per user in Flask?

You can use a key function that identifies users (like IP or user ID) so limits apply individually. Flask-Limiter supports this with the key_func parameter.

What does '10 per hour' mean in rate limiting?

A 10 requests allowed every hour

B 10 requests allowed per second

C 10 users allowed per hour

D 10 requests blocked every hour

It means a user can make 10 requests in one hour before being blocked.

Which Flask extension helps implement rate limiting easily?

A Flask-Migrate

B Flask-Login

C Flask-Mail

D Flask-Limiter

Flask-Limiter is designed to add rate limiting to Flask apps.

Why should rate limiting consider user identity like IP or user ID?

A To block all users at once

B To allow unlimited requests

C To apply limits fairly per user

D To speed up the server

Using user identity helps apply limits individually, preventing one user from affecting others.

What happens when a user exceeds the rate limit?

A Their requests are blocked or delayed

B They get faster responses

C They get logged out automatically

D Nothing happens

Exceeding the limit usually blocks or delays further requests to protect the server.

Which of these is NOT a benefit of rate limiting?

A Stopping brute force attacks

B Allowing unlimited requests

C Preventing server overload

D Improving app stability

Rate limiting restricts requests; it does not allow unlimited requests.

Explain how you would add rate limiting to a Flask route using Flask-Limiter.

Think about the steps from setup to applying limits on routes.

Describe why rate limiting is important for protecting web applications and APIs.

Consider what happens if too many requests come in quickly.