Summer of Protocols

I always thought www before domain names went out of fashion because it was redundant with the http before the ://

But for other protocols, subdomains did make sense because sometimes you serve them over http instead of via their own clients

This still feels a little confused to me. Is there a use case for subdomains as protocol names? Like mail. domain name is the mail server, but mailto:// is the thing that triggers an email client. So http is more like a universal OTP protocol, with www as the default

Blogger at ribbonfarm.com, running summerofprotocols.com, host of /gloom ☀️

http is a universal protocol. www is not needed before domain names. Subdomains are useful for different protocols