code: function addSetMember (key, member, res, next) {
    let redisConnection = res.locals.connection;
    myutil.decodeHTMLEntities(member, function (decodedString) {
      return redisConnection.sadd(key, decodedString, function (err) {
          if (err) {
              console.error('addSetMember', err);
              return next(err);
          }
          res.send('ok');
      });
    });
  }
docs: end new api v2 ========