// Source - https://stackoverflow.com/a/42527003
// Posted by mplungjan, modified by community. See post 'Timeline' for change history
// Retrieved 2025-11-24, License - CC BY-SA 3.0

if (location.host.indexOf("localhost")==-1) { // we are not already on localhost
  var img = new Image();
  img.onerror=function() { location.replace("http://localhost:8080/abc"); }
  img.src="http://servertotest.com/favicon.ico?rnd="+new Date().getTime();
}