I am working on a project where we would like to sync a users events within our site with their yahoo calendar. We are already using oauth to allow access to the contacts api, but I haven't been able to get anything to work with their calendar. I'm getting 401 Unathorized messages when trying to access the yahoo caldav server via https://caldav.calendar.yahoo.com/dav/YAHOO_EMAIL/Calendar. Does anyone know if this is even supported? I see that we can surface an interactive login to sync (and this is what desktop apps use), but I don't see any mention of oauth in the calendar api docs. Any help would be greatly appreciated.