code: function(loadBalancer, callback) {
      var self = this,
          loadBalancerId =
            loadBalancer instanceof lb.LoadBalancer ? loadBalancer.id : loadBalancer;
  
      self._request({
        path: urlJoin(_urlPrefix, loadBalancerId, 'errorpage')
      }, function (err, body) {
        if (err) {
          return callback(err);
        }
        else if (!body || !body.errorpage || !body.errorpage.content) {
          return callback(new Error('Unexpected empty response'));
        }
        else {
          return callback(err, body.errorpage.content);
        }
      });
    }
docs: / Error Page Functionality 
  client.getErrorPage
  
  @description get the error page for the provided load balancer
  
  @param {Object}          loadBalancer      the loadBalancer or loadBalancerId
  @param {function}        callback