Please review below format now :
1 Nginx+error.log = "upstream:" for 24 hours : (2016/11/14 11:47:25 [error] 6823#0: *5991 upstream timed out (110: Connection ti med out) while reading response header from upstream, client: 27.97.130.105, server: example.com, request: "POST /example.com/apis/users/signup HTTP/1.1", upst ream: "http://0.0.0.0:8080/apis/users/signup", host: "example