Hi Maxim,

Maxim Dounin Wrote:
-------------------------------------------------------
> Hello!
>
> On Fri, Jun 05, 2009 at 07:59:13AM -0400,
> funkdoobiest wrote:
>
> > Hi,
> >
> > I have a strange behavior for my site load
> balanced with nginx.
> > I have 1 Loadbalancer with nginx and 3 servers
> with apache.
> >
> > sometimes a request is doubled and send to 2 of
> my apache webservers.
> > this is a big problem for me, because this is
> sometimes a requests that is doing a payement.
> > I checked this behavior with doing a log of all
> my payment transactions and there a some
> transactions
> > for the same person double at the same second!
> (the user can't do this at the website, because I
> send the form which is doing the request with JS
> and ask the User if he really wants to pay and so
> on)
>
> http://wiki.nginx.org/NginxHttpProxyModule#proxy_n
> ext_upstream
>
> Maxim Dounin

Thank you for your help. I set proxy_next_upstream to off, but there are still double requests :-(