502 & 504 error, again

[Maxim Dounin]

Hello!

On Mon, Jan 02, 2012 at 12:37:36PM +0800, Geoge.Q wrote:

> I know it should be a well-known issue.
> I searched and try to find out what on earth it is, but I failed.
> 
> Step:
> 1) nginx works as reverse proxy and the version is V1.0.5,
>    OS: Debian 5.0.3, Kernel Version 2.6.32
> 
> 2) Enabled http 1.1,   504 error  is popup in client;
> the error log indicates:
> -------------------------------------------------
> 2011/12/30 09:40:06 [error] 11013#0: *1 upstream timed out (110: Connection
> timed out) while reading response header from upstream, client:
> 10.208.127.142, server: 1.1.1.1, request: "POST
> /QueryStatManage/StatStudentAction.aspx HTTP/1.1", upstream: "
> http://1.1.1.1:80/QueryStatManage/StatStudentAction.aspx", host: "1.1.1.1",
> referrer: "http://1.1.1.1/QueryStatManage/StatStudentAction.aspx"
> -------------------------------------------------

The "upstream" and "server" seems to be the same, so it looks 
like you've created an infinite proxy loop.

Maxim Dounin