Simple caddyfile with cors enabled for local development

Caddyfile

(cors) {
	@cors_preflight{args.0} method OPTIONS
	@cors{args.0} header Origin {args.0}

	handle @cors_preflight{args.0} {
		header {
			Access-Control-Allow-Origin "{args.0}"
			Access-Control-Allow-Methods "GET, POST, PUT, PATCH, DELETE, OPTIONS"
			Access-Control-Allow-Headers *
			Access-Control-Max-Age "3600"
			defer
		}
		respond "" 204
	}

	handle @cors{args.0} {
		header {
			Access-Control-Allow-Origin "{args.0}"
			Access-Control-Expose-Headers *
			defer
		}
	}
}

http://localhost {
	handle {
		import cors http://localhost:8000
		reverse_proxy backend:8080
	}
}