Keep in mind that this is just an example, adapt the URL to your setup.
Keep in mind that if you’re using WAMPServer (or other local AMP variant) and you used to type “http://localhost” in your browser, that “localhost” will not work for the Arduino. Localhost is the dummy hostname for your computer, when accessed from your computer! For the Arduino “localhost” would mean itself, the Arduino, and not the needed web-server.