It would be nice if Nabu Casa offered support for custom domains. It can be done like this:
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The user sets up a CNAME record for their DNS entry that points to their
asdfjkahsdflkjhasdflk.ui.nabu.casa
home URL. This doesn’t need any changes from the Nabu Casa side . -
The user then needs to set up the custom domain in their Account Settings page in Nabu Casa.
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Nabu Casa uses the regular Let’s Encrypt HTTP challenge flow to verify the domain.
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There’s no step 4. Everything works.