Kludex/uvicorn

An ASGI web server, for Python.

Documentation: https://uvicorn.dev Source Code: https://www.github.com/Kludex/uvicorn

Uvicorn is an ASGI web server implementation for Python.

Until recently Python has lacked a minimal low-level server/application interface for async frameworks. The ASGI specification fills this gap, and means we're now able to start building a common set of tooling usable across all async frameworks.

Uvicorn supports HTTP/1.1 and WebSockets.

This will install uvicorn with minimal (pure Python) dependencies.

This will install uvicorn with "Cython-based" dependencies (where possible) and other "optional extras".

Most well established Python Web frameworks started out as WSGI-based frameworks.

WSGI applications are a single, synchronous callable that takes a request and returns a response. This doesn’t allow for long-lived connections, like you get with long-poll HTTP or WebSocket connections, which WSGI doesn't support well.

Having an async concurrency model also allows for options such as lightweight background tasks, and can be less of a limiting factor for endpoints that have long periods being blocked on network I/O such as dealing with slow HTTP requests.