Why I Built My Own Rate Limiting Library for FastAPI (opens in new tab)

This was originally posted on my blog. I was not planning to build a rate limiting library. I had a FastAPI project, I needed rate limiting, I reached for SlowAPI, which is the most popular choice for FastAPI, and wired it up. Took maybe 20 minutes. Then I started actually using it. The request: Request problem The first thing that got to me was the request: Request requirement. SlowAPI's decorator needs access to the request to extract the client IP or user ID, and the only way it can get th...