code: function postDeleteXSetMember (req, res, next) {
    let key = req.body.key;
    let timestamp = req.body.timestamp;
    let connectionId = req.body.connectionId;
    getConnection(req, res, function () {
        deleteXSetMember(key, timestamp, res, next);
    }, connectionId);
  }
docs: not allowed in redis currently function postEditXSetMember (req, res, next)