Using domain name instead of ip:port

[lleachii]

Route DNS Name locally to an IP

Can't the firewall do that You only have 1 Public IP, correct? If so, you cannot use the firewall with 1 Public IP (i.e. only 1 port 80/tcp available) to somehow "split" it into two private IPs (i.e. somehow make 2 port 80's). You'll need a HTTP proxy that can use "see" the hostname and forward it to the correct server. (You're literally describing why IPv4 NAT and port forwarding exists.)