Rene,
Apart from some extra modules and (mandatory re-branding per the Apache License), IHS (IBM HTTP Server) is nothing but an Apache HTTP Server. Thus you have a number of options you can pursue here:
- create virtual hosts (each virtual host, usually a distinct DNS name, would point to one of your servers). Someone mentioned a reverse proxy, which isone option to do that, but you can also use the specific connector (JK 1.2 or something like that for Tomcat)
- use the same DNS name for all websites, but use either reverse proxy or the specific connectors to send different URIs to different back-end servers. Here you got to be extra careful not to use the same URI for two different app servers.
- anything you find in that regard about Apache Web Server is likely to work seamlessly in IHS
- a good test would be to point the WebSphere plugin to a different application server... I have never seen or heard anything about that before, but I can't think of a reason why it shouldn't work - I think the plugin is quite "agnostic" about the application server, as long as it talks HTTP and gets back to it. Me thinks :-)
Let us know how it goes!
Cheers,
Alexei