function renderPage(url, output) {

  var page = require('webpage').create();
  var redirectURL = null;

  if (phantom.args.length < 2) {
      //console.log('Usage: rasterize.js URL filename');
      phantom.exit();
  } else {
      page.settings.userAgent = 'Mozilla/5.0 (X11; Linux x86_64; rv:39.0) Gecko/20100101 Firefox/50.0';
      page.viewportSize = { width: 1280, height:1024};

      page.onResourceReceived = function(resource) {
      if (url == resource.url && resource.redirectURL) {
          redirectURL = resource.redirectURL;
        }
      };

      page.open(url, function (status) {
          if (redirectURL) {
              renderPage(redirectURL);
          } else if (status == 'success') {
              window.setTimeout(function () {
                  page.render(output);
                  page.close();
                  phantom.exit();
              }, 1000);
          } else {
              console.log('Unable to load the address!');
              page.close();
              phantom.exit();
          }
      });
  }
}

url = phantom.args[0];
output = phantom.args[1];
renderPage(url, output);