/caldav.php/user1/addressbook/andresenesq.vcf some valid etag BEGIN:VCARD VERSION:4.0 FN:Sven Joseph Klaus Michael Andresen\, Esq. FBURL:http://caldav.andresen.local/freebusy END:VCARD HTTP/1.1 200 OK /caldav.php/user1/addressbook/hans_dieter.vcf some valid etag BEGIN:VCARD VERSION:4.0 FN:Hans Dieter Schmidt FBURL:http://davical.hadi-schmist.home/freebusy END:VCARD HTTP/1.1 200 OK