headers

h := headers.Must(headers.ParseString(`
		/*
		  X-Frame-Options: DENY
		  X-XSS-Protection: 1; mode=block

		## A path:
		/templates/index.html
		  # Headers for that path:
		  X-Frame-Options: DENY
		  X-XSS-Protection: 1; mode=block

		/templates/index2.html
		  X-Frame-Options: SAMEORIGIN

		/*
		  Link: </style.css>; rel=preload; as=stylesheet
		  Link: </main.js>; rel=preload; as=script
		  Link: </image.jpg>; rel=preload; as=image
  `))

enc := json.NewEncoder(os.Stdout)
enc.SetIndent("", "  ")
enc.Encode(h)

Output:

{
  "/*": {
    "Link": [
      "\u003c/style.css\u003e; rel=preload; as=stylesheet",
      "\u003c/main.js\u003e; rel=preload; as=script",
      "\u003c/image.jpg\u003e; rel=preload; as=image"
    ],
    "X-Frame-Options": [
      "DENY"
    ],
    "X-Xss-Protection": [
      "1; mode=block"
    ]
  },
  "/templates/index.html": {
    "X-Frame-Options": [
      "DENY"
    ],
    "X-Xss-Protection": [
      "1; mode=block"
    ]
  },
  "/templates/index2.html": {
    "X-Frame-Options": [
      "SAMEORIGIN"
    ]
  }
}