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ce352dc230
Add chunked transfer encoding support to the ASGI worker for HTTP/1.1 streaming responses that don't have a Content-Length header. This fixes SSE (Server-Sent Events) connections not closing properly. Without chunked encoding or Content-Length, HTTP/1.1 clients wait for the connection to close to determine end-of-response, causing streaming endpoints to hang. Also updates the celery_alternative example to use FastAPI with the native ASGI worker and uvloop, demonstrating async task execution with proper SSE streaming.
Gunicorn
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)!
Quick Start
pip install gunicorn
gunicorn myapp:app --workers 4
For ASGI applications (FastAPI, Starlette):
gunicorn myapp:app --worker-class asgi
Features
- 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+
Documentation
Full documentation at https://gunicorn.org
Community
- Report bugs on GitHub Issues
- Chat in #gunicorn on Libera.chat
- See CONTRIBUTING.md for contribution guidelines
Sponsors
Gunicorn is maintained thanks to our sponsors. Become a sponsor.
License
Gunicorn is released under the MIT License. See the LICENSE file for details.