Getting a "Closing Connection" message on every request

[psambit9791]

I am running flask-socketio behind NGINX reverse proxy.

Whenever I start the server, all endpoints seem to have a a "Closing connection" message after.

[2025-03-07 16:45:18 +0000] [42305] [DEBUG] Closing connection. 
[2025-03-07 16:45:18 +0000] [42305] [DEBUG] GET /health/
[2025-03-07 16:45:18 +0000] [42305] [DEBUG] Closing connection. 
[2025-03-07 16:45:39 +0000] [42304] [DEBUG] GET /health/
[2025-03-07 16:45:39 +0000] [42304] [DEBUG] Closing connection. 
[2025-03-07 16:45:48 +0000] [42304] [DEBUG] GET /health/
[2025-03-07 16:45:48 +0000] [42304] [DEBUG] Closing connection. 
[2025-03-07 16:45:48 +0000] [42305] [DEBUG] GET /health/
[2025-03-07 16:45:48 +0000] [42305] [DEBUG] Closing connection.

My Nginx config is as follows:

    location / {
        include proxy_params;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_pass http://0.0.0.0:5000;
    }

    location /socket.io/ {
        include proxy_params;
        proxy_set_header Host $host;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_pass http://0.0.0.0:5000/socket.io/;
        proxy_buffering off;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }

Is this expected behaviour or am I doing something wrong?

[miguelgrinberg]

Which log is printing the closing connection message? Is this Nginx itself, or a Python web server?

[psambit9791]

This log is coming up for gunicorn. @miguelgrinberg

[miguelgrinberg]

Is there anything that does not work? As far as I can see this is normal. You have enabled DEBUG level logs, so I think it is expected you'll get noisy logging.

[psambit9791]

Hey @miguelgrinberg , I tested this and am not getting any errors. I think I was just concerned at connections being closed on requests and wasn't sure if it was expected behaviour. Thanks :)