Comment # 2 on bug 72133 from
I just gave it a try in reaction to your question.

Discovery via https://[www] fails for various reasons.

Using one of the urls mentioned elsewhere (google "icloud caldav url") leads to
a different error:

[<?xml version='1.0' encoding='UTF-8'?><error xmlns='DAV:'><Require-User-Agent
xmlns='urn:mobileme:davservices'>User-Agent Header is

Adding a User-Agent is possible, but will require some changes to the source
code. Let me know if you can and want to work on the source and I'll provide

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