HTTP/1.1 400 Bad Request
Date: Dow, 01 Jan 2000 00:00:00 GMT
DAV: 1, 2, 3, access-control, calendar-access, calendar-schedule
DAV: extended-mkcol, calendar-proxy, bind, addressbook
Content-Location: /caldav.php/user1/home/
ETag: "567b0424ecca3303b030d882be2093ef"
Content-Length: 86
Content-Type: text/xml; charset="utf-8"

<?xml version="1.0" encoding="utf-8" ?>
<error xmlns="DAV:">
 <invalid-xml/>
</error>