[CalendarServer-users] REPORT request and iCal Server

Hello, I'm trying to talk to iCal Server from a WebObjects app with CalDAV4J (Java API from the Chandler Project). I can connect and get a specific calendar, but I'm trying to do a REPORT request: REPORT /calendars/users/diradmin/calendar/ HTTP/1.1 and I'm getting a 401 HTTP error: HTTP/1.1 401 Unauthorized WWW-Authenticate: digest nonce="174385117913098369521756197356", realm="/Search", algorithm="md5" In the Chandler examples, they are querying "/cosmo/dav/test/ collection", so I guess I'm not querying the good thing or I don't understand the REPORT query. What is the correct URL for a REPORT query ? Thanks.