The following command returns whether the specified session is valid or not:
http://calendarserver/check_id.wcap? id=n3l0eeu6s3n3o3b8v &fmt-out=text/calendar
The output returned is:
HTTP/1.1 200 Date: Thu, 14 Dec 2002 19:48:17 GMT Content-type: text/calendar; charset=UTF-8 Content-length: 131 Last-modified: Thu, 14 Dec 2002 19:48:17 GMT Pragma: no-cache Expires: 0 Cache-Control: no-cache Connection: Keep-Alive BEGIN:VCALENDAR PRODID:-//SunJavaSystem/Calendar Hosting Server//EN METHOD:PUBLISH VERSION:6.0 X-NSCP-WCAP-CHECK-ID:1 END:VCALENDAR