Hi Francis,

> Are you concerned about the request or the response being buffered?

my problem is that response that my node app (upstream server) generates is buffered by nginx.
My actual goal is to know speed and amount of data that my node app sent to a client. So, when I sent 20MB binary blob from node I can wait till data is sent out and I'll know approximate speed and size. The moment I put my node app behind an nginx proxy things fall apart: suddenly all transfers are instant, and I cannot even know if entire 20MB of data was delivered or if the connection failed in the middle. When I updated some of these buffering configs things improved, but still were failing with smaller uploads that are still fully buffered by nginx.