Forward a request

I want to make a controller that:
1) Gets invoked from the browser and where the request contains some
form data
2) The controller needs to forward the request to another webserver
(different domain)
3) Extract a part of the resulting response and serv it to the view

I have learnt through this forum (thank you Tom Lieber) how to call a
remote server and extract part of the respons.
But I do not know how to extract the incoming request object and
forward it to the remote server.
Can someone give me some pointers in the right direction?