Добавление событий на Baikal CalDAV server с использованием переполнения стека

Я хочу отправить события в календарь CalDAV, который установлен на моем веб-хосте. Я использую Байкал CalDAV сервер.

Это мой PHP:

<?php
$uid = "test-12345"; // setting this to an existing uid updates event, a new uid adds event
$url = "http://infobo9.myhostpoint.ch/dav/cal.php/principals/bookify"; //http://mail.domain.com/calendars/DOMAIN/USER/Calendar/'.$uid.'.ics'
$userpwd = "bookify:test";
$description = 'My event description here';
$summary = 'My event title 1';
$tstart = '20141127T000000Z';
$tend = '20141127T000000Z';
$tstamp = gmdate("Ymd\THis\Z");

$body = "<<<__EOD
BEGIN:VCALENDAR
VERSION:2.0
BEGIN:VEVENT
DTSTAMP:$tstamp
DTSTART:$tstart
DTEND:$tend
UID:$uid
DESCRIPTION:$description
LOCATION:Office
SUMMARY:$summary
END:VEVENT
END:VCALENDAR
__EOD";

echo $body . "<br>";

$headers = array(
'Content-Type: text/calendar; charset=utf-8',
'If-None-Match: *',
'Expect: ',
'Content-Length: '.strlen($body),
);
$fp = fopen(dirname(__FILE__).'/errorlog.txt', 'w');

$ch = curl_init();
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_STDERR, $fp);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($ch, CURLOPT_USERPWD, $userpwd);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
curl_setopt($ch, CURLOPT_POSTFIELDS, $body);
curl_exec($ch);
curl_close($ch);

echo "done"?>

Вывод PHP:

<<<__EOD BEGIN:VCALENDAR VERSION:2.0 BEGIN:VEVENT DTSTAMP:20141127T181856Z DTSTART:20141127T000000Z DTEND:20141127T000000Z UID:test-12345 DESCRIPTION:My event description here LOCATION:Office SUMMARY:My event title 1 END:VEVENT END:VCALENDAR __EOD
done

Я получаю это как вывод CURL:

* About to connect() to infobo9.myhostpoint.ch port 80 (#0)
*   Trying 217.26.52.30... * connected
* Connected to infobo9.myhostpoint.ch (217.26.52.30) port 80 (#0)
* Server auth using Basic with user 'bookify'
> PUT /dav/cal.php/principals/bookify HTTP/1.1
Host: infobo9.myhostpoint.ch
Accept: */*
Content-Type: text/calendar; charset=utf-8
If-None-Match: *
Content-Length: 260

< HTTP/1.1 200 OK
< Date: Thu, 27 Nov 2014 18:02:16 GMT
< Server: Apache/2.2.29 (FreeBSD) DAV/2 mod_ssl/2.2.29 OpenSSL/1.0.1j mod_hcgi/0.9.4
< X-Powered-By: PHP/5.4.32
< Set-Cookie: PHPSESSID=j2q0hmd7tvvo2egbf521tj5q82; path=/; HttpOnly
< Expires: Thu, 19 Nov 1981 08:52:00 GMT
< Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
< Pragma: no-cache
< Transfer-Encoding: chunked
< Content-Type: text/html
<
* Connection #0 to host infobo9.myhostpoint.ch left intact
* Closing connection #0

Событие не добавляется на сервер CalDAV. Есть идеи, почему это не работает?