HTTP redirect problem - fully qualified host name - tomcat 5.5.9 / mod-jk / Load balancing

[Ashley Hayes <ashley.hayes (at) macalla.com>]

Hi all,
   We use tomcat's formbased authentication (post to /j_security_check), the
bases of which is a HTTP 302 redirect on success.

We have a problem because tomcat/mod jk is issuing a full URL to the client
that points at an internal ( private) IP/server - as opposed to the public
IP/domain name that the user has in their browser. E.g.

________________HTTP Request _______________

POST /topup/j_security_check HTTP/1.1
Host: samplepublicdomain.com
....

_______________HTTP Response _______________

HTTP/1.1 302 Moved Temporarily
Date: Fri, 06 Oct 2006 09:39:38 GMT
Server: Apache/2.0.46 (Red Hat)
Location: http://192.168.50.110/test/
.....
__________________________________________



We need the redirect url to be  http://samplepublicdomain.com/test/


Our configuration is: 2 apache httpd servers connected with mod jk (in
loadbalance mode with stick sessions) to 2 tomcat servers.
1. I've tried apache httpd.conf "ServerName samplepublicdomain.com:80" 
2. I've tried tomcat server.xml setting <Host
name="samplepublicdomain.com"....>

For those who think they can help please find more details below.
Any suggestion would be much appreciated,
Kind regards,
Ashley 











Server network schematic ( I hope this comes out ok)

	
                __ Apache/2.0.46 ----------------> Tomcat5.5.9
               /    (private IP1  \    />           (private IP1 )
              /       HTTP port 80)\  /               mod-jk port 8009
Loadbalancer /                      \/
(public IP - \                      /\
on port 80)   \                    /  \>
               \__ Apache/2.0.46 ---------------> Tomcat5.5.9
                   (private IP2                    (private IP2
                     HTTP port 80)                    mod-jk port 8009)


 
Note - to simulate a hardware load balancer that will be used in production,
I have configured a separate apache on a machine with a public IP that uses
mod_proxy_balancer, but I do not think this is the issue.




The configuration all works except for redirects, gggrrrrrr....






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