PROPFIND https://caldav.calendar.yahoo.com/
<?xml version="1.0" encoding="UTF-8" ?>
<DAV:multistatus xmlns:AI="http://apple.com/ns/ical/"
xmlns:CS="http://calendarserver.org/ns/"
xmlns:DAV="DAV:"
xmlns="urn:ietf:params:xml:ns:caldav"
xmlns:ical="http://www.w3.org/2002/12/cal/ical#">