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

其将请求路径 /assets/*filepath 映射到目录 /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
• …

我们也可以将 http.FileServer 作为 NotFound 处理器, 比如 /robots.txt, /favicon.ico.

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