Automatically forward subdomain to port on localhost

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4

Maybe something like this:

:443 {
	tls internal {
		on_demand
	}

	@portLocalhost header_regexp port Host ^([0-9]+)\.localhost$
	handle @portLocalhost {
		reverse_proxy localhost:{re.port.1}
	}

	handle {
		respond "Bad hostname" 400
	}
}

But a config like this would only be appropriate for development/local use. I cannot recommend this kind of pattern for production. Using on_demand opens you up for abuse unless you configure Caddy with the ask option to limit the domains for which certificates are issued.

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