In the documentation at http://manual.qooxdoo.org/current/pages/communication/rest.html is stated that:
Handlers receive a qx.event.type.Rest event that, among other properties, includes the response.
But there is no response in qx.event.type.Rest - http://demo.qooxdoo.org/current/apiviewer/#qx.event.type.Rest
How to get that response?