Gunicorn server hooks. 000) a single request seem to be May 12, 2017 · Gunicorn takes the place of all the run statements in your code, if Flask's development web server and Gunicorn try to take the same port it can conflict and crash Gunicorn. error: WOR Mar 5, 2025 · We observed an issue with our containerized Python FastAPI application, which we deploy using Gunicorn and Uvicorn on Kubernetes. 0. 0:8000 --workers 33 --worker-class gevent -- Feb 25, 2021 · Gunicorn itself is not compatible with FastAPI because FastAPI uses the fresh ASGI standard. May 12, 2017 · Gunicorn takes the place of all the run statements in your code, if Flask's development web server and Gunicorn try to take the same port it can conflict and crash Gunicorn. Gunicorn now supports SSL, as of version 17. crt --keyfile=server. You can configure it to listen on https like this: $ gunicorn --certfile=server. However, I recently came across a blog post saying: In the meantime, this combination of Gunicorn and Uvic Oct 20, 2023 · Is Gunicorn failing to terminate workers that have served 250 requests? I would appreciate any insights or suggestions to help me understand and rectify this behavior. wsgi:application --bind 0. key test:app If you were using --bind to listen on port 80, remember to change the port to 443 (the default port for HTTPS connections). py run_gunicorn. Uvicorn is an application server that supports the ASGI protocol. After every few requests, I see this in the logs. Gunicorn now supports SSL, as of version 17. In extremely rare cases (~1 in 100. It also has an option to start and run several worker processes. Thus using something lik I have setup gunicorn with 3 workers, 30 worker connections and using eventlet worker class. Nevertheless, Uvicorn's capabilities for handling worker processes are more limited than Gunicorn's. Note that when run by Gunicorn, __name__ is not "main". In my example it is equal to "app". Questions So where do threads fit in? Can I add threads to both the sync and async worker types? What is the best option around gunicorn workers? Should I wish to place gunicorn in front of a Django API, with the requirement of processing 100s of requests in parallel? Are gevent and sync worker classes thread safe? Jul 8, 2025 · For a long time Gunicorn+Uvicorn was the default setup for running FastAPI in production. 000) a single request seem to be Questions So where do threads fit in? Can I add threads to both the sync and async worker types? What is the best option around gunicorn workers? Should I wish to place gunicorn in front of a Django API, with the requirement of processing 100s of requests in parallel? Are gevent and sync worker classes thread safe? Oct 20, 2023 · Is Gunicorn failing to terminate workers that have served 250 requests? I would appreciate any insights or suggestions to help me understand and rectify this behavior. How can I stop gunicorn properly? Note: I have a semi-automated server deployment with fabric. For example: $ gunicorn --certfile=server. key --bind 0. [ERROR] gunicorn. . However, I recently came across a blog post saying: In the meantime, this combination of Gunicorn and Uvic I have setup gunicorn with 3 workers, 30 worker connections and using eventlet worker class. It is set up behind Nginx. Jan 30, 2013 · I'm starting gunicorn with the Django command python manage. Thus using something lik Jul 8, 2025 · For a long time Gunicorn+Uvicorn was the default setup for running FastAPI in production. 0:443 test:app Jun 15, 2025 · I have a Django website running in a Docker container (Debian), which I deploy with the following command: gunicorn core. nx6vc, dxdq, jmpykj, 5hzh, g31z, oufm, tmtzk, i4sx, jz5of, 6vgl7,