Nginx double requests for my upstreams?

[Maxim Dounin]

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_next_upstream

Maxim Dounin