We are using IBM Web Server plugin to load balance in a cluster of web servers. So far we are routing the requests based on URLs. We now need to route a set of requests using combination of URL and a header value. How can this be done?
You simply cannot -- the WAS WebServer Plugin only considers the host, URL, and session affinity. Are you trying to select an alternate cluster, or just a specific backend server?
Either way, the only viable option is to manipulate the URL or session cookie and use the normal routing.