caddy/caddytest/integration/caddyfile_adapt/shorthand_parameterized_placeholders.txt

localhost:80
respond * "{header.content-type} {labels.0} {query.p} {path.0} {re.name.0}"
----------
{
	"apps": {
		"http": {
			"servers": {
				"srv0": {
					"listen": [
						":80"
					],
					"routes": [
						{
							"match": [
								{
									"host": [
										"localhost"
									]
								}
							],
							"handle": [
								{
									"handler": "subroute",
									"routes": [
										{
											"handle": [
												{
													"body": "{http.request.header.content-type} {http.request.host.labels.0} {http.request.uri.query.p} {http.request.uri.path.0} {http.regexp.name.0}",
													"handler": "static_response"
												}
											]
										}
									]
								}
							],
							"terminal": true
						}
					]
				}
			}
		}
	}
}