It's possible, but not exactly user friendly. WinGate 7.x will make this easy to do.
Basically, you need to use the Web Server section of the proxy to redirect the connections to a different URL, but the Web Server section of the proxy only deals with server requests (i.e. not proxy requests). So in order to make this work, you need to fool the clients into think that WinGate is the web server responsible for yahoo.com. That's acheived using the hosts file. Basic steps are as follows:
1. Add any domain names that you want to redirect to the hosts file and set the IP address as the internet IP address of the WinGate computer
2. Use the Web Server section of the proxy to redirect the request
- Click Add
- In the General tab, set the Action to "Redirect" and specify a new URL to redirect requests to.
- In the Hosts tab, add the hostnames that you want to be redirected, i.e. yahoo.com and
www.yahoo.com, etc.