Finally, the guy (Djitz) who successfully implemented reversed proxy posted his guide in setting reverse proxy to work with Lotus Domino Web server. Domino server used in this case is Domino 7.0.1.
The case might be like this: you have a domino web server, but it has only local IP address and will be kept like that. Then you have an Apache web server in which published as public/Internet IP address. Your company doesn't implement neither RAS nor VPN. Now your boss wants to be able access his domino webmail or web applications from any Internet stations during his business trip. So how can Internet users access that local Domino Server? The answer is to implement Reversed Proxy.
Read complete guide at here. Thanks Djitz, this guide is invaluable!