HTTPSSH.

Why not just SSH/QUIC, what does the HTTP/3 layer add that QUIC doesn’t already have?

QuickShell - it should be called

Quicshell*

QSH?

At least that isn’t an existing ham radio Q-code!

That's already a project (library for building a desktop environment).

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The ability to use HTTP authentication methods, HTTP headers, etc?

easy access to reverse proxies