Thanks again Yann.
You are correct, this is exactly the behavior I'm looking to configure, the backend application needs the /frontpage path but we don't want users to need to add it. However, I wish I could say I'm making progress but I'm really not other than I have a better understanding of why it's failing.
It does not matter if I append the /frontpage path to the end of the ProxyPath directive or the BalancerMember declarations. Here is what happens:
Without any Rewrite directive, the request is directed to the backend per the ProxyPath declaration as:
The backend then sends a request for 'GET /frontpage/login.jsp' using the vanity URL and it again hits the proxy. However, the proxy just goes back through the same direction and again appends the request using ProxyPass. It ends up looking like:
So, using the rewrite rule:
RewriteRule "^/frontpage(.+)" "$1" [R,L]
And the rewrite rule again strips the '/frontpage' from the GET request and causes it to fail.
I have to imagine there is a rewrite condition or conditions that will allow for the desired behavior to work but I'm just not experienced enough yet.
I hope I have not completely confused the situation, any guidance is greatly appreciated as always..