Send a request to a remote server and show the response in a modal dialog.

shorten.js

var shorten = function(){
  var frame = document.createElement('iframe');
  var body = document.body;
  var location = document.location;
  var url = "";

  if (!body) {
    document.alert("Unable to shorten the url, try again after the page finishes loading");
    return;
  }

  try {
    url = "http://localhost:4567?url=";
    url += encodeURIComponent(location.href);
    frame.setAttribute('src',url);
    frame.style.position = "fixed";
    frame.style.top = "0px";
    frame.style.left = "0px";
    frame.style.right = "0px";
    frame.style.left = "0px";
    frame.style.background = "transparent";
    frame.style.border = "none";
    frame.style['z-index'] = "2147483647";
    frame.setAttribute('name','gurl');
    body.appendChild(frame);
  } catch(e) {
    document.alert('There was an error while processing the request to shorten that url.');
  }

};