code: func (client *Client) UpdateApplicationRestart(appGUID string) (Application, Warnings, error) {
  	request, err := client.newHTTPRequest(requestOptions{
  		RequestName: internal.PostApplicationActionRestartRequest,
  		URIParams:   map[string]string{"app_guid": appGUID},
  	})
  	if err != nil {
  		return Application{}, nil, err
  	}
  
  	var responseApp Application
  	response := cloudcontroller.Response{
  		DecodeJSONResponseInto: &responseApp,
  	}
  	err = client.connection.Make(request, &response)
  
  	return responseApp, response.Warnings, err
  }
docs: // UpdateApplicationRestart restarts the given application.