nginx has problem sending request body to upstream

[Roman Arutyunyan]

Hello Allen,

On Fri, Apr 12, 2019 at 06:01:14AM -0400, allenhe wrote:
> 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

According to the log, request (323 bytes) is sent to the upstream server, but
no response is sent back within the given time period.

-- 
Roman Arutyunyan