sni-redirect.js

(function(w) {
  try {

    var isHttps = w.location.protocol === "https:";
    var hasSniSupport = true;//we default to true
    var ua = window.navigator.userAgent;
    var isInternetExplorerOnWinXpOrOlder = /MSIE.*Windows\s?((NT)?\s?(([0-5]\.\d))|XP|98|95|NT;)/i.test(ua);
    var isAndroid3XorOlder = /Android [0-3]\./i.test(ua);
    var isSymbian = /(SymbianOS|Series40|Series60)/i.test(ua);
    var isBlackBerry = /BlackBerry/i.test(ua);

    if(isInternetExplorerOnWinXpOrOlder || isAndroid3XorOlder || isSymbian || isBlackBerry) hasSniSupport = false;

    if(!isHttps && hasSniSupport) {
      //alert('Browser probably supports SNI, will "soft redirect" to secure https site');
      w.location.href = "https:" + w.location.href.substring(w.location.protocol.length);
    }

  } catch(e) {
    //alert('Something went wrong with SNI "soft redirect": '+e.message)
  }
}(window));