Rate limiting in FastAPI - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is rate limiting in FastAPI?

Rate limiting is a way to control how many requests a user or client can make to a FastAPI app in a given time. It helps prevent overload and abuse.

beginner

Which FastAPI tool or library can be used to implement rate limiting?

You can use third-party libraries like 'slowapi' or 'fastapi-limiter' to add rate limiting to FastAPI apps easily.

intermediate

How does rate limiting improve API security and performance?

Rate limiting stops too many requests from one user, which protects the server from overload and reduces chances of attacks like denial of service.

intermediate

What is a common strategy to identify clients for rate limiting in FastAPI?

Clients are often identified by their IP address or API key to apply rate limits per user or device.

beginner

What happens when a client exceeds the rate limit in FastAPI?

The server responds with a 429 Too Many Requests status code, telling the client to slow down and try later.

What HTTP status code indicates a client has hit the rate limit?

A 429 Too Many Requests

B 403 Forbidden

C 500 Internal Server Error

D 404 Not Found

429 status code means the client sent too many requests in a given time.

Which library is commonly used to add rate limiting in FastAPI?

A requests

B uvicorn

C slowapi

D pydantic

'slowapi' is a popular library for rate limiting in FastAPI.

Rate limiting helps to:

A Prevent server overload

B Increase request speed

C Allow unlimited requests

D Disable API authentication

Rate limiting controls request flow to avoid server overload.

What is a common way to identify clients for rate limiting?

A By browser type

B By IP address

C By screen resolution

D By operating system

IP address is commonly used to track clients for rate limiting.

If a client exceeds the rate limit, the server will:

A Ignore the client

B Return 200 status code

C Restart the server

D Return 429 status code

The server responds with 429 Too Many Requests when rate limit is exceeded.

Explain how rate limiting works in FastAPI and why it is important.

Think about how servers stay healthy when many users connect.

Describe how you would add rate limiting to a FastAPI app using a library.

Consider the steps from setup to response handling.