Programming language: Python
License: BSD 3-clause "New" or "Revised" License
Tags: HTTP     Internet     WWW     ASGI Servers    
Latest version: v0.15.0

uvicorn alternatives and similar packages

Based on the "ASGI Servers" category.
Alternatively, view uvicorn alternatives based on common mentions on social networks and blogs.

Do you think we are missing an alternative of uvicorn or a related project?

Add another 'ASGI Servers' Package


The lightning-fast ASGI server.

Build Status Package version

Documentation: https://www.uvicorn.org

Requirements: Python 3.6+ (For Python 3.5 support, install version 0.8.6.)

Uvicorn is a lightning-fast ASGI server implementation, using uvloop and httptools.

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

Uvicorn currently supports HTTP/1.1 and WebSockets. Support for HTTP/2 is planned.


Install using pip:

$ pip install uvicorn

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

$ pip install uvicorn[standard]

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

In this context, "Cython-based" means the following:

  • the event loop uvloop will be installed and used if possible.
  • the http protocol will be handled by httptools if possible.

Moreover, "optional extras" means that:

  • the websocket protocol will be handled by websockets (should you want to use wsproto you'd need to install it manually) if possible.
  • the --reloader flag in development mode will use watchgod.
  • windows users will have colorama installed for the colored logs.
  • python-dotenv will be installed should you want to use the --env-file option.
  • PyYAML will be installed to allow you to provide a .yaml file to --log-config, if desired.

Create an application, in example.py:

async def app(scope, receive, send):
    assert scope['type'] == 'http'

    await send({
        'type': 'http.response.start',
        'status': 200,
        'headers': [
            [b'content-type', b'text/plain'],
    await send({
        'type': 'http.response.body',
        'body': b'Hello, world!',

Run the server:

$ uvicorn example:app

Uvicorn is BSD licensed code.Designed & built in Brighton, England.— ๐Ÿฆ„ —

*Note that all licence references and agreements mentioned in the uvicorn README section above are relevant to that project's source code only.