Nginx session-stickiness

[Rob Mueller]

>>  http://wiki.codemongers.com/NginxHttpProxyModule#proxy_next_upstream
>
> Won't this have the downside of possibly sending multiple failing
> requests to the upstreams?  We used this for a while but ran into
> problems with duplicate requests.  For example we had people sending
> WAY too many mails out in an request, the appserver would timeout
> halfway through, it'd send a portion of the emails, and then send the

It would be nice if you could just use:

proxy_next_upstream connect_failed;

At the moment it seems "error" refers to too many things, including an 
upstream timeout.

Rob