Request hang server

When uploading a big file (mean one request sending…), can’t send any other request (like another new window for user list).

Does anyone have any idea why happen this?

How do you start the server? bench start (develop mode) or bench restart (production mode)?

Production mode

I am not 100% sure about my answer.

I also experienced this. This is also mentioned in some discussions in this blog.
This may be caused by time-out issued either from gunicorn or nginx.
There are also some discussions here on how to try to overcome or work-around time-out issues