Comment 2 for bug 1445318

https://dav.site.ru/cal.php/calendars/876974/default/
My path to CalDav

Excample https://www.MYSERVER.de/baikal/card.php/principals/USER/ or artocle http://mikkovuorela.com/blog/computers/setting-up-evolution-and-android-to-work-with-a-caldav-calendar-and-a-carddav-contact-list/

If you need, I can provide your own, customized Baïkal: CalDAV for testing.

PS - In the setting of the current server must be set basic authentication.