The following examples are for each of output data types.
iCalendar:
http://calendarserver/version.wcap ?fmt-out=text/calendar
BEGIN:VCALENDAR PRODID:-//iPlanet/Calendar Hosting Server//EN METHOD:PUBLISH VERSION:2.0 X-NSCP-WCAPVERSION:2.0.0 END:VCALENDAR
XML:
http://calendarserver/version.wcap ?fmt-out=text/xml
<?xml version="1.0" encoding="UTF-8"?\> <iCalendar\> <iCal version="2.0" prodid="-//iPlanet/Calendar Hosting Server//EN"\> <X-NSCP-WCAPVERSION\>2.0.0</X-NSCP-WCAPVERSION\> </iCal\> </iCalendar\>