code: function echoRequest(data, echo) {
          return _execute('PUT', '/mocks', {
              identifier: _getIdentifier(data),
              echo: echo || false
          }, 'Could not echo the request');
      }
docs: Sets the given echo indicator for the mock matching the identifier.
  @param {Object | String} data The data object containing all the information for an expression or the name of the mock.
  @param {boolean} echo The indicator echo request.
  @return {Promise} the promise.