Hacker News Reader

Regarding 3, buffering behavior is highly configurable in nginx.(eg. proxy_request_buffering, proxy_buffering on/off)

Wrote a post where I ran into (and fixed) this problem with streaming uploads through nginx: http://killtheradio.net/technology/nginx-returns-error-on-fi...

It's only as of 1.8 that you can disable buffering of incoming requests though. Just a few month iirc.