Buffering issues with nginx

[Dan34]

> X-Accel-Buffering: no
> That will disable nginx's buffering for the request.

At first it looked like exactly what I was looking for (after reading nginx
docs), but after trying I observed that there were no effects from that.
In code that writes headers I added res.setHeader('X-Accel-Buffering',
'no');

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,275526,275603#msg-275603