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receive_data() stores every DATA frame in both _body_chunks (list) and request_body (BytesIO). The receive() closure in _handle_http2_request() has two read paths: a streaming path that pops from _body_chunks, and a fast path that reads from BytesIO. After the streaming path consumed the body, the fast path could re-read the same data from BytesIO because body_received was never set in the streaming return path. This caused the application to receive a doubled request body (e.g. 18 bytes sent, 36 bytes received), breaking JSON parsing with "Extra data" errors. Fix: set body_received = True in the streaming path when _body_complete is True, preventing the fast path from re-reading already-consumed data. Fixes #3558
Gunicorn
Gunicorn is maintained by volunteers. If it powers your production, please consider supporting us:
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 for FastAPI, Starlette, Quart
- HTTP/2 support (beta) with multiplexed streams
- Dirty Arbiters (beta) 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
Support
Powering Python apps since 2010. Support continued development.
Sponsors
License
Gunicorn is released under the MIT License. See the LICENSE file for details.