Just updated from 10.0.2 to 11. Everything seemed fine until I noticed my calendars were out of sync. Looking into the logs I found the following entries:
Sabre\DAV\Exception\NotFound react-text: 53 : /react-text HTTP/1.1 404 Principal with name users not found
Sabre\DAV\Exception\NotAuthenticated react-text: 42 : /react-text HTTP/1.1 401 No āAuthorization: Basicā header found. Either the client didnāt send one, or the server is misconfigured
Removing the caldav-account on my device and readding it showed me, that Apple iCal was not able to authenticate, because it received the aforementioned 404 error.
I rolled back to 10.0.2, but this can not be the final saying on the topic, can it?
I use nginx 1.10.2 + PHP 7.0.14 + mysql Ver 15.1 Distrib 10.1.19-MariaDB.
It would be great if changes like these could be found in some kind of migration document. I found the new URLs by looking at the Calendar and Contacts app and just happened to know that they were different in NC10.