Apache -> Nginx miration problem. Different tcp options?

[atlantos]

Hello,

I am in migration process of Joomla with JoomGalery component from apache to nginx. Joomgallery uses http://jupload.sourceforge.net/ applet to upload images. Problem is that Jupload applet do not upload images and returns 'wjhk.jupload2.exception.JUploadException: unexpected EOF (in header)'. I got the same error on different browsers and OS. At first load  Jupload applet checks post url with HEAD request. With nginx I got error 'Unable to access to the postURL: 'http://www.server/administrator/index.php?option=com_joomgallery&task=juploadhandler_receive''. To debug problem, I captured tcp stream with tcpdump.

Bellow is tcpdump for apache. Client and server requests are show on left:
21:29:22.974011 IP 192.168.1.158.53590 > server.80: S 1107190968:1107190968(0) win 65535 
21:29:23.064207 IP server.80 > 192.168.1.158.53590: S 984647680:984647680(0) ack 1107190969 win 5792 
21:29:23.064244 IP 192.168.1.158.53590 > server.80: . ack 1 win 33304 
21:29:23.064563 IP 192.168.1.158.53590 > server.80: P 1:389(388) ack 1 win 33304                        - HEAD /administrator/index.php?option=com_joomgallery&task=juploadhandler_receive HTTP/1.1
21:29:23.071329 IP 192.168.1.158.53590 > server.80: F 389:389(0) ack 1 win 33304 
21:29:23.156267 IP server.80 > 192.168.1.158.53590: . ack 389 win 54 
21:29:23.156299 IP 192.168.1.158.53590 > server.80: F 389:389(0) ack 1 win 33304 
21:29:23.200585 IP server.80 > 192.168.1.158.53590: . ack 390 win 54 
21:29:23.200637 IP 192.168.1.158.53590 > server.80: . ack 1 win 33304 
21:29:23.245360 IP server.80 > 192.168.1.158.53590: . ack 390 win 54 
21:29:23.334561 IP server.80 > 192.168.1.158.53590: P 1:214(213) ack 390 win 54                          - HTTP/1.1 200 OK
21:29:23.334566 IP server.80 > 192.168.1.158.53590: F 214:214(0) ack 390 win 54 
21:29:23.334626 IP 192.168.1.158.53590 > server.80: . ack 214 win 33197 
21:29:23.334654 IP 192.168.1.158.53590 > server.80: . ack 215 win 33197 

Bellow is tcpdump for nginx:
19:49:33.805120 IP 192.168.1.158.51975 > server.80: S 4062245563:4062245563(0) win 65535 
19:49:33.809760 IP server.80 > 192.168.1.158.51975: S 3823098756:3823098756(0) ack 4062245564 win 5792 
19:49:33.809808 IP 192.168.1.158.51975 > server.80: . ack 1 win 65535 
19:49:33.809973 IP 192.168.1.158.51975 > server.80: P 1:464(463) ack 1 win 65535  - HEAD /administrator/index.php?option=com_joomgallery&task=juploadhandler_receive HTTP/1.1
19:49:33.809996 IP 192.168.1.158.51975 > server.80: F 464:464(0) ack 1 win 65535 
19:49:33.815810 IP server.80 > 192.168.1.158.51975: . ack 464 win 54 
19:49:33.815843 IP 192.168.1.158.51975 > server.80: F 464:464(0) ack 1 win 65535 
19:49:33.818232 IP server.80 > 192.168.1.158.51975: F 1:1(0) ack 465 win 54 
19:49:33.818262 IP 192.168.1.158.51975 > server.80: . ack 2 win 65535 
19:49:33.820036 IP server.80 > 192.168.1.158.51975: . ack 465 win 54 

Nginx logs:
==> ../logs/access.log <==
192.168.1.158 - - [27/Jun/2009:23:40:36 -0400] "HEAD /administrator/index.php?option=com_joomgallery&task=juploadhandler_receive HTTP/1.1" 499 0 "-" "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_5_7; en-us) AppleWebKit/530.18 (KHTML, like Gecko) Version/4.0.1 Safari/530.18"

==> ../logs/error.log <==
2009/06/27 23:40:36  5110#0: *11 client closed prematurely connection, so upstream connection is closed too while sending request to upstream, client: 192.168.1.158, server: server, request: "HEAD /administrator/index.php?option=com_joomgallery&task=juploadhandler_receive HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "www.server"

In both cases Jupload applet sends following headers:
HEAD /administrator/index.php?option=com_joomgallery&task=juploadhandler_receive HTTP/1.1
Host: www.server
Accept: */*
Accept-Encoding: identity
Connection: close
Cookie: 2d6498ed29010381ca627f9124f1eeba=6fa36898d3935f245e49837a54c8ee64
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_5_7; en-us) AppleWebKit/530.18 (KHTML, like Gecko) Version/4.0.1 Safari/530.18

I tried to enable/disable tcp_nodelay and tcp_nopush in config file, but it didn't help much. Apache and Nginx are running on the same host, so all system sysctl settings are the same.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,3492,3492#msg-3492