Caddy - Invert Request Matcher

Caddyfile

(negate) {
	# Set the initial values
	vars {args.0} false
	vars {args.1} true

	# On match invert the values
	vars @{args.0} {args.0} true
	vars @{args.0} {args.1} false

	# Create the inverse matcher
	@{args.1} `{vars.{args.1}} != false`
}

example.com {
	@allowed remote_ip 192.168.0.0/16 172.16.0.0/12 10.0.0.0/8 127.0.0.1/8
	import negate allowed denied

	# Example
	handle @allowed {
		respond "Allowed: {vars.allowed} / {vars.denied}"
	}

	# Example
	handle @denied {
		respond "Denied: {vars.allowed} / {vars.denied}"
	}

	# Example
	respond @denied 403
	skip_log @allowed
}