Build a listener

I need a listener for a webservice that I use. This listeners needs to route incoming traffic to the correct local page. We use an external back-end for our recruitment website. On ocassion we send traffic to a form that is hosted on the original server (of the external back-end), in order to make sure the traffic lands on the correct page on our page I need a "listener". I really need this fixed in the next few hours, so good communications in English are needed. European devs preferred.