diff --git a/Makefile b/Makefile
index 531c595..fa9348c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-all: mitmproxy dummycert
+all: mitmproxy
 
 .PHONY: mitmproxy
 mitmproxy:
diff --git a/addon/web/web.go b/addon/web/web.go
index ac8f162..e47ce0e 100644
--- a/addon/web/web.go
+++ b/addon/web/web.go
@@ -36,41 +36,36 @@ func (web *WebAddon) echo(w http.ResponseWriter, r *http.Request) {
 
 type WebAddon struct {
 	addon.Base
-	addr      string
-	upgrader  *websocket.Upgrader
-	serverMux *http.ServeMux
-	server    *http.Server
+	upgrader *websocket.Upgrader
 
 	conns   []*concurrentConn
 	connsMu sync.RWMutex
 }
 
-func NewWebAddon() *WebAddon {
+func NewWebAddon(addr string) *WebAddon {
 	web := new(WebAddon)
-	web.addr = ":9081"
 	web.upgrader = &websocket.Upgrader{
 		CheckOrigin: func(r *http.Request) bool {
 			return true
 		},
 	}
 
-	web.serverMux = new(http.ServeMux)
-	web.serverMux.HandleFunc("/echo", web.echo)
+	serverMux := new(http.ServeMux)
+	serverMux.HandleFunc("/echo", web.echo)
 
-	// web.serverMux.Handle("/", http.FileServer(http.Dir("addon/web/client/build")))
 	fsys, err := fs.Sub(assets, "client/build")
 	if err != nil {
 		panic(err)
 	}
-	web.serverMux.Handle("/", http.FileServer(http.FS(fsys)))
+	serverMux.Handle("/", http.FileServer(http.FS(fsys)))
 
-	web.server = &http.Server{Addr: web.addr, Handler: web.serverMux}
+	server := &http.Server{Addr: addr, Handler: serverMux}
 	log = log.WithField("in", "WebAddon")
 	web.conns = make([]*concurrentConn, 0)
 
 	go func() {
-		log.Infof("server start listen at %v\n", web.addr)
-		err := web.server.ListenAndServe()
+		log.Infof("web interface start listen at %v\n", addr)
+		err := server.ListenAndServe()
 		log.Error(err)
 	}()
 
diff --git a/cmd/mitmproxy/main.go b/cmd/mitmproxy/main.go
index 7081e31..020ec1b 100644
--- a/cmd/mitmproxy/main.go
+++ b/cmd/mitmproxy/main.go
@@ -12,6 +12,7 @@ import (
 
 type Config struct {
 	addr      string
+	webAddr   string
 	dump      string // dump filename
 	dumpLevel int    // dump level
 }
@@ -20,6 +21,7 @@ func loadConfig() *Config {
 	config := new(Config)
 
 	flag.StringVar(&config.addr, "addr", ":9080", "proxy listen addr")
+	flag.StringVar(&config.webAddr, "web_addr", ":9081", "web interface listen addr")
 	flag.StringVar(&config.dump, "dump", "", "dump filename")
 	flag.IntVar(&config.dumpLevel, "dump_level", 0, "dump level: 0 - header, 1 - header + body")
 	flag.Parse()
@@ -53,7 +55,7 @@ func main() {
 	}
 
 	p.AddAddon(&addon.Decoder{})
-	p.AddAddon(web.NewWebAddon())
+	p.AddAddon(web.NewWebAddon(config.webAddr))
 
 	log.Fatal(p.Start())
 }