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Hypercorn is an ASGI web server based on the sans-io hyper, h11, h2, and wsproto libraries and inspired by Gunicorn. Hypercorn supports HTTP/1, HTTP/2, WebSockets (over HTTP/1 and HTTP/2), ASGI/2, and ASGI/3 specifications. Hypercorn can utilise asyncio, uvloop, or trio worker types.

Hypercorn can optionally serve the current draft of the HTTP/3 specification using the aioquic library. To enable this install the h3 optional extra, pip install hypercorn[h3] and then choose a quic binding e.g. hypercorn --quic-bind localhost:4433 ....

Hypercorn was initially part of Quart before being separated out into a standalone ASGI server. Hypercorn forked from version 0.5.0 of Quart.


Hypercorn can be installed via pip,

$ pip install hypercorn

and requires Python 3.7.0 or higher.

With hypercorn installed ASGI frameworks (or apps) can be served via Hypercorn via the command line,

$ hypercorn module:app

Alternatively Hypercorn can be used programatically,

import asyncio
from hypercorn.config import Config
from hypercorn.asyncio import serve

from module import app, Config()))

learn more (including a Trio example of the above) in the API usage docs.


Hypercorn is developed on GitLab. If you come across an issue, or have a feature request please open an issue. If you want to contribute a fix or the feature-implementation please do (typo fixes welcome), by proposing a merge request.


The best way to test Hypercorn is with Tox,

$ pipenv install tox
$ tox

this will check the code style and run the tests.


The Hypercorn documentation is the best place to start, after that try searching stack overflow, if you still can't find an answer please open an issue.