URI and Host replace

thank you Kevin , this will work for the client request the server will respond back to the client with x.b.com:port and uri /portal/* which need to be mapped back to host a.x.com and uri [/retail/* or /corporate/*] based on the original request .

also , on the user's browser address bar , I need to hide the mapped uri path after /retail and /corporate [/retail/xxxxx] and [/corporate/xxxxx]

please can you help me with this