The goal is to extend Nuxeo Rest API (nuxeo/api/v1/...) and no authentication happening. For this, one wants to leverage the openUrl mechanism.
While openUrl is found working for nuxeo/site/... WebObjects, it does not work out of the box for the nuxeo/api/v1/... WebObjects.
One wants to get use the openUrl with nuxeo/api/v1/... WebObjects.