REPORT /egroupware/groupdav.php/birgit/calendar/ HTTP/1.1
Host: boulder.outdoor-training.de
Depth: 1
Content-Type: application/xml; charset="utf-8"
Authorization: Basic cmFsZjpyYWxiZWMzMg==
Content-Length: 187

<?xml version="1.0" encoding="utf-8" ?>
<C:free-busy-query xmlns:C="urn:ietf:params:xml:ns:caldav">
  <C:time-range start="20110922T000000Z" end="20110929T000000Z"/>
</C:free-busy-query>
