Help for Nginx 502 Bad Gateway Error About Uploading Data

Help for Nginx 502 Bad Gateway Error About Uploading Data, for this Problem Try
During node.js Got error

Error 

2014/05/20 04:30:20 [error] 31070#0: *5 upstream prematurely closed connection while reading response header from upstream, client: ... [clipped]

Solution

server {
  location / {
    keepalive 64
  }
}