DAVdroid dropped support for preemptive authentication in version 1.2.3. Returning the DAV:unauthenticated pseudo-principal as specified in RFC 5397 doesn't seem to work for DAVdroid.
DAVdroid dropped support for preemptive authentication in version 1.2.3. Returning the DAV:unauthenticated pseudo-principal as specified in RFC 5397 doesn't seem to work for DAVdroid.