DESCRIPTION: attachment with url

METHOD: PUT

AUTH: true

URL: calendar/95C0F1E7-F691-42DD-8889-4E0B700B9778-3.ics

CONTENTTYPE: text/calendar

CONTENT:
BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:-//Example Inc.//Example Calendar//EN
BEGIN:VEVENT
SUMMARY:New Event
DTSTART:20111203T190000Z
DTSTART:20111202T200000Z
DTSTAMP:20060710T225223Z
UID:95C0F1E7-F691-42DD-8889-4E0B700B9778-3
ATTACH:http://www.example.com/test.jpg
END:VEVENT
END:VCALENDAR