Hello!

On Thu, Dec 29, 2011 at 04:07:41AM -0500, defage wrote:

> you mean at that moment all of upstream server has to tried,and it
> reponse 504? but at that moment only one app server's log throw error
> info.
> A part of access_log like:
> 10.001 10.001 /cas/login 10.10.2.100:8080 504
> 10.001 10.001 /cas/login 10.10.2.100:8080 504
>
> If pass to all servers, the log is like below:?
> 10.001 10.001 /cas/login 10.10.2.100:8080, 10.10.2.101:8080,
> 10.10.2.102:8080, 10.10.2.103:8080 504
>
>
> the problem is my app server 's log show ,at that moment only one server
> of upstream have 504 error.

It looks like you are trying to handle timeouts, not 504 returned
by an upstream server. You have to specify "timeout" in
proxy_next_upstream directive, not "http_504".

Or better just remove the proxy_next_upstream directive from your
config, default value "error timeout" is good enough in most
cases.

Maxim Dounin

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