Hi, Willy Tarreau <[email protected]> wrote: > Hi Maik, > > On Tue, Jul 28, 2009 at 12:31:23AM +0200, Maik Broemme wrote: > > Hi, > > > > is it possible to set the listen address of HAProxy as an HTTP-Request > > Header? For example if you have HAProxys running on multiple servers and > > balance the requests to multiple backend servers, which have a NAT router > > between HAProxys and backend servers, it would be very nice to have a > > header like 'X-Forward-Via' or 'X-Forward-From'. Did someone know if > > this is possible? > > you have two possibilities : > > - you know each one of your haproxy servers, so you configure them > to simply add a Via header (using reqadd with their name). Eg: > > reqadd Via:\ haproxy1 >
Well this isn't enough, because I need the ip address. > - you just want to forward the address the client connected to, > which should match the listen address when there's only one > listen address. Then you can enable "option originalto" which > you contributed, and get this IP address in the "x-original-to" > header. > Well this would be enough, if I won't use HAProxy as transparent proxy. On the system running HAProxy, I will redirect the connections to HAProxy with iptables and HAProxy itself will forward them to a SQUID farm. Between HAProxys and the SQUIDs are some NAT-Router. The SQUID itself uses some proprietary extension which relies on the IP from which the HTTP connection comes. - 'X-Forward-For' gives me the client address. (Client) - 'X-Original-To' gives me the original destination address. (Webserver) If HAProxy is transparent between both, what gives me that address? :) PS: I have contributed the 'X-Original-To' patch, but in that setup it won't help me. It wouldn't be much work, so I can also contribute a patch for it. > Hoping this helps, > Willy > --Maik
