projecto completo creo, me quedo bonito :3

file_server.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"github.com/go-chi/chi"
+	"net/http"
+)
+
+func fileServer(r chi.Router, path string, root http.FileSystem) {
+	fs := http.StripPrefix(path, http.FileServer(root))
+
+	if path != "/" && path[len(path)-1] != '/' {
+		r.Get(path, http.RedirectHandler(path+"/", 301).ServeHTTP)
+		path += "/"
+	}
+	path += "*"
+
+	r.Get(path, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		fs.ServeHTTP(w, r)
+	}))
+}