Gunicorn 21.2.0 has been released. This version fix the issue introduced in the threaded worker.
Changes:
21.2.0 - 2023-07-19
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fix thread worker: revert change considering connection as idle .
*** NOTE ***
This is fixing the bad file description error.
- Documentation is available there: https://docs.gunicorn.org/en/stable/news.html
- Packages: https://pypi.org/project/gunicorn/