How do I configure a reverse proxy on the same machine?

I have WAS 8.5.5.10 installed with my application public URL of https://clm.domain/jts - note no port implied 443.  I now want to install a reverse a reverse proxy in front of this on the same server in preparation of moving some of the applications to separate servers.  I am looking at https://jazz.net/wiki/bin/view/Deployment/CreatingAProxyServerWithWebSpherePlugins as a reference.  It implies as a first step I would do this by just editing the httpd.conf file and adding a virtual host entry with the same host name.  I am not sure how to do that as a pass thru as won't both IHS and WAS would be trying to listen on 443?  Once I move an application, I think I just follow the direction in this article and copy the plugin directory to the IHS server.
Could someone clarify better what the httpd.conf file would look like as a starting point where I am co-located on the same server with a public uri of https://clm.domain/jts  ?

Thanks