Notifications REST URL is badly computed and can be broken in some conditions

The current code does:

var restURL = xm.restURL.substring(0, xm.restURL.indexOf('/rest/')) + '/rest/notifications?media=json'; 

This is not clean at all.
A correct way to do it would be

var restURL = "${request.contextPath}/rest/notifications?media=json";

(even if it requires velocity to parse the code, for which I have been criticized in the past)