docs: function urlToId(hypemUrl) {
          var trimmedUrl = _.trim(hypemUrl);
          if (_.startsWith(trimmedUrl, HYPEM_TRACK_URL)) {
              var parsedUrl = url.parse(hypemUrl);
              var pathname = parsedUrl.pathname; // '/trach/31jfi/...'
              var hypemId = pathname.split("/")[2];
              return hypemId;
          }
          return "";
      }