diff --git a/addon/web.go b/addon/web.go
new file mode 100644
index 0000000..ddf50ff
--- /dev/null
+++ b/addon/web.go
@@ -0,0 +1,145 @@
+package addon
+
+import (
+	"net/http"
+	"text/template"
+
+	"github.com/gorilla/websocket"
+	"github.com/sirupsen/logrus"
+)
+
+func (web *WebAddon) echo(w http.ResponseWriter, r *http.Request) {
+	c, err := web.upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		web.log.Print("upgrade:", err)
+		return
+	}
+	defer c.Close()
+	for {
+		mt, message, err := c.ReadMessage()
+		if err != nil {
+			web.log.Println("read:", err)
+			break
+		}
+		web.log.Printf("recv: %s", message)
+		err = c.WriteMessage(mt, message)
+		if err != nil {
+			web.log.Println("write:", err)
+			break
+		}
+	}
+}
+
+func home(w http.ResponseWriter, r *http.Request) {
+	homeTemplate.Execute(w, "ws://"+r.Host+"/echo")
+}
+
+type WebAddon struct {
+	Base
+	addr      string
+	upgrader  *websocket.Upgrader
+	serverMux *http.ServeMux
+	server    *http.Server
+	log       *logrus.Entry
+}
+
+func NewWebAddon() *WebAddon {
+	web := new(WebAddon)
+	web.addr = ":9081"
+	web.upgrader = &websocket.Upgrader{}
+
+	web.serverMux = new(http.ServeMux)
+	web.serverMux.HandleFunc("/echo", web.echo)
+	web.serverMux.HandleFunc("/", home)
+
+	web.server = &http.Server{Addr: web.addr, Handler: web.serverMux}
+
+	web.log = log.WithField("in", "WebAddon")
+
+	go func() {
+		web.log.Infof("server start listen at %v\n", web.addr)
+		err := web.server.ListenAndServe()
+		web.log.Error(err)
+	}()
+
+	return web
+}
+
+var homeTemplate = template.Must(template.New("").Parse(`
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<script>  
+window.addEventListener("load", function(evt) {
+
+    var output = document.getElementById("output");
+    var input = document.getElementById("input");
+    var ws;
+
+    var print = function(message) {
+        var d = document.createElement("div");
+        d.textContent = message;
+        output.appendChild(d);
+    };
+
+    document.getElementById("open").onclick = function(evt) {
+        if (ws) {
+            return false;
+        }
+        ws = new WebSocket("{{.}}");
+        ws.onopen = function(evt) {
+            print("OPEN");
+        }
+        ws.onclose = function(evt) {
+            print("CLOSE");
+            ws = null;
+        }
+        ws.onmessage = function(evt) {
+            print("RESPONSE: " + evt.data);
+        }
+        ws.onerror = function(evt) {
+            print("ERROR: " + evt.data);
+        }
+        return false;
+    };
+
+    document.getElementById("send").onclick = function(evt) {
+        if (!ws) {
+            return false;
+        }
+        print("SEND: " + input.value);
+        ws.send(input.value);
+        return false;
+    };
+
+    document.getElementById("close").onclick = function(evt) {
+        if (!ws) {
+            return false;
+        }
+        ws.close();
+        return false;
+    };
+
+});
+</script>
+</head>
+<body>
+<table>
+<tr><td valign="top" width="50%">
+<p>Click "Open" to create a connection to the server, 
+"Send" to send a message to the server and "Close" to close the connection. 
+You can change the message and send multiple times.
+<p>
+<form>
+<button id="open">Open</button>
+<button id="close">Close</button>
+<p><input id="input" type="text" value="Hello world!">
+<button id="send">Send</button>
+</form>
+</td><td valign="top" width="50%">
+<div id="output"></div>
+</td></tr></table>
+</body>
+</html>
+`))
diff --git a/go.mod b/go.mod
index cef5c16..12a0f0c 100644
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,7 @@ go 1.15
 require (
 	github.com/andybalholm/brotli v1.0.1
 	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e
+	github.com/gorilla/websocket v1.4.2
 	github.com/jordwest/mock-conn v0.0.0-20180617021051-4896c6bd1641
 	github.com/sirupsen/logrus v1.7.0
 )
diff --git a/go.sum b/go.sum
index 2d06e82..339e81f 100644
--- a/go.sum
+++ b/go.sum
@@ -4,6 +4,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e h1:1r7pUrabqp18hOBcwBwiTsbnFeTZHV9eER/QT5JVZxY=
 github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
+github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
+github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
 github.com/jordwest/mock-conn v0.0.0-20180617021051-4896c6bd1641 h1:ChkB2s4mFDekyUUmbNE7qNhennP0rfqF2YZUOGxbhFk=
 github.com/jordwest/mock-conn v0.0.0-20180617021051-4896c6bd1641/go.mod h1:AJFEOPtj5Z5z3MAy+0uvjQAH02iRnQr6fnvuHYp/Jek=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
