A rate limiting extension for Starlette and Fastapi
A rate limiting library for Starlette and FastAPI adapted from flask-limiter.
This package is used in various production setups, handling millions of requests per month, and seems to behave as expected.
There might be some API changes when changing the code to be fully
async, but we will notify users via appropriate
semver version changes.
The documentation is on read the docs.
slowapi is available from pypi so you can install it as usual:
$ pip install slowapi
Most feature are coming from FlaskLimiter and the underlying limits.
- Single and multiple
limitdecorator on endpoint functions to apply limits
- redis, memcached and memory backends to track your limits (memory as a fallback)
- support for sync and async HTTP endpoints
- Support for shared limits across a set of routes
Limitations and known issues
requestargument must be explicitly passed to your endpoint, or
slowapiwon't be able to hook into it. In other words, write:
@limiter.limit("5/minute") async def myendpoint(request: Request) pass
@limiter.limit("5/minute") async def myendpoint() pass
websocketendpoints are not supported yet.
Developing and contributing
PRs are more than welcome! Please include tests for your changes :)
The package uses poetry to manage dependencies. To setup your dev env:
$ poetry install
To run the tests:
Credits go to flask-limiter of which SlowApi is a (still partial) adaptation to Starlette and FastAPI.
It's also important to mention that the actual rate limiting work is done by limits,
slowapi is just a wrapper around it.
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