deal with unslashed static

Author: robx

serve/main.go

@@ -46,6 +46,9 @@ func main() {
 func mux(static string, score ScoreHandler) *httprouter.Router {
 	r := httprouter.New()
 	if static != "" {
+		if !strings.HasSuffix(static, "/") {
+			static += "/"
+		}
 		r.GET("/", func(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
 			http.ServeFile(w, r, static+"index.html")
 		})