code: function filterByUrls(url) {
          if(_config.refererIndependentUrls) {
              var isRefererIndependend = false;
              for(var i in _config.refererIndependentUrls) {
                  if(new RegExp(_config.refererIndependentUrls[i]).test(url.split('?')[0])) {
                      isRefererIndependend = true;
                      break;
                  }
              }
              return isRefererIndependend;
          } else {
              return url === '/';
          }
      }
docs: This method checks by configured whitelist, if the url is in the list of allowed urls without a
  referer in the header
  @param url
  @returns {boolean}