Mr4x

http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    http.ServeFile(w, r, "index.html")
})
http.Handle("/assets/", http.StripPrefix("/assets/", http.FileServer(http.Dir("./path/to/assets"))))

filepath.Walk(path, func(subpath string, info os.FileInfo, err error) error {
	if err == nil && path != subpath {
		...
	}
	return nil
})