router.ServeFiles("/assets/*filepath", http.Dir("/path/to/assets"))

It maps request path /assets/*filepath to directory /path/to/assets:

• GET /assets/css/app.css => /path/to/assets/css/app.css
• GET /assets/js/app.js => /path/to/assets/js/app.js
• …

Sometimes, it is useful to treat http.FileServer as NotFound handler, such as /robots.txt, /favicon.ico.

router.NotFound = http.FileServer(http.Dir("public"))