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As I recall, there are some reasonable dns-related reasons that one might prefer www (or any subdomain) to the bare name.

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Modern solution to these issues is having SRV record on appropriate protocol sub-domain which AFAIK (and somewhat surprisingly) is honored by most modern browsers.

Do you have more information about this?

https://jdebp.eu/FGA/dns-srv-record-use-by-clients.html

Browsers don't use SRV records for HTTP. With them one wouldn't need www subdomain CNAME hacks.

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