HTTP/1.1 200 OK
Date: Dow, 01 Jan 2000 00:00:00 GMT
DAV: 1, 2, 3, access-control, calendar-access, calendar-schedule
ETag: "0a963d6aa5a4ae8d91f2f6cebe27ad96"
Content-Length: 331
Content-Type: text/xml; charset="utf-8"

<?xml version="1.0" encoding="utf-8" ?>
<schedule-response xmlns="DAV:" xmlns:C="urn:ietf:params:xml:ns:caldav">
 <C:response>
  <C:recipient>
   <href>mailto:ultrabogosity@example.net</href>
  </C:recipient>
  <C:request-status>3.7;Invalid Calendar User</C:request-status>
  <C:calendar-data/>
 </C:response>
</schedule-response>