Http Redirection through a Proxy App

[gAbE]

Hi there.

I have created a VB.NET tcp server/client and web proxy application. There is one problem... In the webproxy, I can determine what url the client is going to through Internet Explorer but I would like to find a way redirect to another url.

Example: The client goes to http://www.google.com but I would like it to go to http://www.yahoo.com. I know how to determine which url is entered by the client but I don't know how to redirect.

Is there a solution?
Thanks