code: function getQueryDelay(url) {
      var delay;
      if (options.delayQueryParam) {
        var parsedUrl = parseUrl(url, true);
  
        if (parsedUrl.query && parsedUrl.query[options.delayQueryParam]) {
          var queryDelay = parseInt(parsedUrl.query[options.delayQueryParam]);
          if (queryDelay > 0) {
            delay = queryDelay;
          }
        }
      }
  
      return delay;
    }
docs: Return the query delay if it makes sense for this request, else undefined