curl -X GET -u login -H "Accept: text/calendar" https://myserver/joe/home/
curl -X GET -u login -H "Accept: text/calendar" https://myserver/joe/home.ics

curl -X PROPFIND -u login -H "Content-Type: text/xml" -H "Depth: 1"
  --data "<propfind xmlns='DAV:'><prop><calendar-data xmlns='urn:ietf:params:xml:ns:caldav'/></prop></propfind>"
  https://myserver/joe/home/

<address-data xmlns="urn:ietf:params:xml:ns:carddav"/>