URL Redirect iRule Question

Well, I found out some new information today from our web server team and I think that is why the iRule is not working. www1.abc.com is a web server with an external IP of x.x.x.x. The web server abc.corp.com is in a pool on the LTM which is assigned to the virtual server. www1.abc.com is configured to redirect to the IP of the virtual server of the LTM which resolves to abc.corp.com. So, the LTM sees the request coming from abc.corp.com and the iRule does not work since the data group is set for www1.abc.com/ := abc.corp.com/. So, it doesn't appear this iRule will work since the users are not connecting directly to the LTM.