For reference and transparency: We have created this report on Apple Bug Reporter on 23 Feb 2016 here:

When creating a calendar by MKCALENDAR without supported-calendar-component-set, iCloud doesn’t set without supported-calendar-component-set by itself.

So the without supported-calendar-component-set property stays undefined, which means (RFC 4791):

“In the absence of this property, the server MUST accept all component types, and the client can assume that all component types are accepted.”

Steps to Reproduce:

  1. Create CalDAV collection with MKCALENDAR. Don’t specify supported-calendar-component-set.
  2. Use PROPFIND to verify that supported-calendar-component-set is not set.

Expected Results:
iCloud doesn’t show this collection as “Calendars” and “Reminders”, but only as one of them.

Actual Results:
CalDAV calendars without supported-calendar-component-set should show up as both “calendars” and “reminders”.

iCloud (23 Feb 2016)


direct CalDAV requests (curl/command line)


This issue behaves as intended based on the following:

The first VOBJECT - VEVENT or TODO will decide the type of this container.

Please update your bug report to let us know if this is still an issue for you.

Our response:

I understand this, but I think it’s against the CalDAV specification and just wanted to report it.