Proxy Auto-Configuration URL
One of the easiest ways to change your IP address with a proxy server is by using a proxy auto-configuration URL in your web browser. A proxy auto-configuration URL tells your browser when to use a proxy server, and what proxy server hostname and port to use.
How does a Proxy Auto-Configuration URL Work?
How do I use it with an Authenticated Proxy Server?
Because proxy auto-configuration URLs do not support specifying proxy usernames and password (and for good reason, because it would be a security risk), you must use IP address authentication. Once your IP is registered with the proxy server, then the proxy auto-config will handle the rest, by specifying the proxy server hostname and port for each request.
How do I setup Automatic Proxy Configuration?
Once you have a URL to auto-config the proxy, you must go into your browser's proxy or network settings and look for a setting such as Automatic proxy configuration, Autoconfiguration URL, Automatic proxy configuration URL, or PAC File URL, and then copy/paste the URL. Once you save this URL in the settings, your browser will be using the automatic proxy configuration for all future requests.