diff --git a/main.go b/main.go
index e3baed7..130d539 100644
--- a/main.go
+++ b/main.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	_ "embed"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -11,6 +12,9 @@ import (
 	"net/http"
 )
 
+//go:embed nullboard.html
+var nullboard string
+
 type server struct {
 	db   storage.DBStream
 	crud bool
@@ -21,10 +25,14 @@ func main() {
 	as.Append(args.INT, "p", "port", 8121)
 	as.Append(args.STRING, "db", "db type", "mapstream")
 	as.Append(args.STRING, "dbaddr", "db addr", "/tmp/db")
+	as.Append(args.STRING, "level", "debug level", "info")
 	as.Append(args.BOOL, "nocrud", "no support CRUD api", false)
 	if err := as.Parse(); err != nil {
 		panic(err)
 	}
+	logb.Set(logb.LevelFromString(as.GetString("level")))
+
+	logb.Debugf("nullboard=%v", len(nullboard))
 
 	db, err := storage.New(storage.TypeFromString(as.GetString("db")), as.GetString("dbaddr"))
 	if err != nil {
@@ -50,7 +58,6 @@ func (server server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		defer w2.Close()
 		w = w2
 	}
-	fileServer := http.FileServer(http.Dir("./"))
 	switch r.URL.Path {
 	case "/api":
 		if server.crud {
@@ -61,8 +68,8 @@ func (server server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 	default:
-		logb.Debug("serving dir", r.URL.Path)
-		fileServer.ServeHTTP(w, r)
+		logb.Debug("serving nullboard.html", r.URL.Path)
+		fmt.Fprintln(w, nullboard)
 		return
 	}
 	logb.Debug("404", r.URL.Path)