docs: function createUser(ctx, next) {
              client.post({
                  path: '/v1/users/'
              }, {
                  username: opts.username,
                  email: opts.email,
                  password: opts.password
              }, function _afterCreateUser(err, req, res, body) {
                  if (err && !res) {  // e.g. connect error
                      return next(err);
                  }
                  ctx.createStatusCode = res.statusCode;
                  ctx.createErr = err;
                  ctx.createBody = body;
                  next();
              });
          }