caddy/caddytest/integration/caddyfile_adapt/bind_ipv6.txt

example.com {
	bind tcp6/[::]
}
----------
{
	"apps": {
		"http": {
			"servers": {
				"srv0": {
					"listen": [
						"tcp6/[::]:443"
					],
					"routes": [
						{
							"match": [
								{
									"host": [
										"example.com"
									]
								}
							],
							"terminal": true
						}
					]
				}
			}
		}
	}
}