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Gunicorn 'Green Unicorn' is a Python WSGI HTTP Server for UNIX. It's a pre-fork worker model ported from Ruby's Unicorn project. The Gunicorn server is broadly compatible with various web frameworks, simply implemented, light on server resource usage, and fairly speedy.

New in v25: Per-app worker allocation for dirty arbiters, HTTP/2 support (beta)!

pip install gunicorn
gunicorn myapp:app --workers 4

For ASGI applications (FastAPI, Starlette):

gunicorn myapp:app --worker-class asgi

• WSGI support for Django, Flask, Pyramid, and any WSGI framework
• ASGI support (beta) for FastAPI, Starlette, Quart
• HTTP/2 support (beta) with multiplexed streams
• Dirty Arbiters for heavy workloads (ML models, long-running tasks)
• uWSGI binary protocol for nginx integration
• Multiple worker types: sync, gthread, gevent, eventlet, asgi
• Graceful worker process management
• Compatible with Python 3.9+

Full documentation at https://gunicorn.org

• Quickstart
• Configuration
• Deployment
• Settings Reference

• Report bugs on GitHub Issues
• Chat in #gunicorn on Libera.chat
• See CONTRIBUTING.md for contribution guidelines

Powering Python apps since 2010. Support continued development.

Gunicorn is released under the MIT License. See the LICENSE file for details.