caddy/caddytest/integration/caddyfile_adapt/header_placeholder_search.caddyfiletest

:80 {
	header Test-Static ":443" "STATIC-WORKS"
	header Test-Dynamic ":{http.request.local.port}" "DYNAMIC-WORKS"
	header Test-Complex "port-{http.request.local.port}-end" "COMPLEX-{http.request.method}"
}
----------
{
	"apps": {
		"http": {
			"servers": {
				"srv0": {
					"listen": [
						":80"
					],
					"routes": [
						{
							"handle": [
								{
									"handler": "headers",
									"response": {
										"replace": {
											"Test-Static": [
												{
													"replace": "STATIC-WORKS",
													"search_regexp": ":443"
												}
											]
										}
									}
								},
								{
									"handler": "headers",
									"response": {
										"replace": {
											"Test-Dynamic": [
												{
													"replace": "DYNAMIC-WORKS",
													"search_regexp": ":{http.request.local.port}"
												}
											]
										}
									}
								},
								{
									"handler": "headers",
									"response": {
										"replace": {
											"Test-Complex": [
												{
													"replace": "COMPLEX-{http.request.method}",
													"search_regexp": "port-{http.request.local.port}-end"
												}
											]
										}
									}
								}
							]
						}
					]
				}
			}
		}
	}
}