nginx has problem sending request body to upstream

[allenhe]

Hi,

The Nginx hangs at proxying request body to the upstream server but with no
error indicating what's happening until the client close the font-end
connection. can somebody here help give me any clue? following is the debug
log snippet:

2019/04/12 14:49:38 [debug] 92#92: *405 epoll add connection: fd:29
ev:80002005
2019/04/12 14:49:38 [debug] 92#92: *405 connect to 202.111.0.40:1084, fd:29
#406
2019/04/12 14:49:38 [debug] 92#92: *405 http upstream connect: -2
2019/04/12 14:49:38 [debug] 92#92: *405 posix_memalign: 0000000001CCA480:128
@16
2019/04/12 14:49:38 [debug] 92#92: *405 event timer add: 29:
2000:1555051780835
2019/04/12 14:49:38 [debug] 92#92: *405 http finalize request: -4,
"/inetmanager/v1/configinfo?" a:1, c:2
2019/04/12 14:49:38 [debug] 92#92: *405 http request count:2 blk:0
2019/04/12 14:49:38 [debug] 92#92: *405 http run request:
"/inetmanager/v1/configinfo?"
2019/04/12 14:49:38 [debug] 92#92: *405 http upstream check client, write
event:1, "/inetmanager/v1/configinfo"
2019/04/12 14:49:38 [debug] 92#92: *405 http upstream request:
"/inetmanager/v1/configinfo?"
2019/04/12 14:49:38 [debug] 92#92: *405 http upstream send request handler
2019/04/12 14:49:38 [debug] 92#92: *405 http upstream send request
2019/04/12 14:49:38 [debug] 92#92: *405 http upstream send request body
2019/04/12 14:49:38 [debug] 92#92: *405 chain writer buf fl:1 s:323
2019/04/12 14:49:38 [debug] 92#92: *405 chain writer in: 0000000001CB5498
2019/04/12 14:49:38 [debug] 92#92: *405 writev: 323 of 323
2019/04/12 14:49:38 [debug] 92#92: *405 chain writer out: 0000000000000000
2019/04/12 14:49:38 [debug] 92#92: *405 event timer del: 29: 1555051780835
2019/04/12 14:49:38 [debug] 92#92: *405 event timer add: 29:
600000:1555052378841
2019/04/12 14:50:17 [debug] 92#92: *405 http run request:
"/inetmanager/v1/configinfo?"
2019/04/12 14:50:17 [debug] 92#92: *405 http upstream check client, write
event:0, "/inetmanager/v1/configinfo"
2019/04/12 14:50:17 [info] 92#92: *405 epoll_wait() reported that client
prematurely closed connection, so upstream connection is closed too while
sending request to upstream, client: 202.111.0.51, server: , request: "GET
/inetmanager/v1/configinfo HTTP/1.1", upstream:
"http://202.111.0.40:1084/inetmanager/v1/configinfo", host:
"202.111.0.37:1102"
2019/04/12 14:50:17 [debug] 92#92: *405 finalize http upstream request: 499



Thanks,
Allen

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,283735,283735#msg-283735