keep-alive connection cause download hangs in Nginx after 0.7.67

[WilliamOMS]

Hello,

I am running into this download hanging issue. We are using nginx as a
download server with SSL and secure download module enabled. When using
nginx-0.7.67, it works well. But when we try to upgrade to nginx-0.8.54,
there is a download hanging issue. We figured out it is related to
keep-alive header or reusing TCP connection. When we download a small
file and it finished, then in a few seconds, in same browser, if trying
to download again, the download hangs. Nginx doesn't print out any log
message. If we turn off keep-alive in either browser or nginx server in
0.8.54 by setting keepalive_timeout 0;, then it works well.

Our environment is: Solaris 10, nginx 0.7.67/0.8.54, secure download
module, SSL.

The other difference between 0.7.67 and 0.8.54 is in the error.log
message. In 0.7.67, when download finished, it always print out message
as below:
     2011/01/27 15:27:31 [info] 12616#0: *1 client xxx.xxx.xxx.xxx
closed keepalive connection
But in 0.8.54, it never prints out this message. We have same config
file for both 0.7.67 and 0.8.54.

I think setting keepalive_timeout to 0 is just a workaround and it may
have performance impact. Trying to find out if there is better solution
for this. 

Thanks for any suggestions.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,170139,170139#msg-170139