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?

Sincerely Jonas