diff --git a/server/proxy/http.go b/server/proxy/http.go
index 2c4f1fd4..761fa805 100644
--- a/server/proxy/http.go
+++ b/server/proxy/http.go
@@ -181,18 +181,26 @@ func (pxy *HTTPProxy) GetRealConn(remoteAddr string) (workConn net.Conn, err err
 		})
 	}
 
+	name := pxy.GetName()
+	proxyType := pxy.GetConfigurer().GetBaseConfig().Type
+	rwc = wrapCountingReadWriteCloser(rwc, func(bytes int64) {
+		metrics.Server.AddTrafficOut(name, proxyType, bytes)
+	}, func(bytes int64) {
+		metrics.Server.AddTrafficIn(name, proxyType, bytes)
+	})
+
 	workConn = netpkg.WrapReadWriteCloserToConn(rwc, tmpConn)
-	workConn = netpkg.WrapStatsConn(workConn, pxy.updateStatsAfterClosedConn)
-	metrics.Server.OpenConnection(pxy.GetName(), pxy.GetConfigurer().GetBaseConfig().Type)
+	workConn = netpkg.WrapCloseNotifyConn(workConn, func(error) {
+		pxy.updateStatsAfterClosedConn()
+	})
+	metrics.Server.OpenConnection(name, proxyType)
 	return
 }
 
-func (pxy *HTTPProxy) updateStatsAfterClosedConn(totalRead, totalWrite int64) {
+func (pxy *HTTPProxy) updateStatsAfterClosedConn() {
 	name := pxy.GetName()
 	proxyType := pxy.GetConfigurer().GetBaseConfig().Type
 	metrics.Server.CloseConnection(name, proxyType)
-	metrics.Server.AddTrafficIn(name, proxyType, totalWrite)
-	metrics.Server.AddTrafficOut(name, proxyType, totalRead)
 }
 
 func (pxy *HTTPProxy) Close() {
diff --git a/server/proxy/proxy.go b/server/proxy/proxy.go
index 564eca28..f3a30cc5 100644
--- a/server/proxy/proxy.go
+++ b/server/proxy/proxy.go
@@ -263,11 +263,18 @@ func (pxy *BaseProxy) handleUserTCPConnection(userConn net.Conn) {
 
 	name := pxy.GetName()
 	proxyType := cfg.Type
+	local = wrapCountingReadWriteCloser(local, nil, func(bytes int64) {
+		metrics.Server.AddTrafficIn(name, proxyType, bytes)
+	})
+	userConn = netpkg.WrapReadWriteCloserToConn(
+		wrapCountingReadWriteCloser(userConn, nil, func(bytes int64) {
+			metrics.Server.AddTrafficOut(name, proxyType, bytes)
+		}),
+		userConn,
+	)
 	metrics.Server.OpenConnection(name, proxyType)
-	inCount, outCount, _ := libio.Join(local, userConn)
+	_, _, _ = libio.Join(local, userConn)
 	metrics.Server.CloseConnection(name, proxyType)
-	metrics.Server.AddTrafficIn(name, proxyType, inCount)
-	metrics.Server.AddTrafficOut(name, proxyType, outCount)
 	xl.Debugf("join connections closed")
 }
 
diff --git a/server/proxy/traffic_counter.go b/server/proxy/traffic_counter.go
new file mode 100644
index 00000000..c3297a74
--- /dev/null
+++ b/server/proxy/traffic_counter.go
@@ -0,0 +1,36 @@
+package proxy
+
+import "io"
+
+type countingReadWriteCloser struct {
+	io.ReadWriteCloser
+	onRead  func(int64)
+	onWrite func(int64)
+}
+
+func wrapCountingReadWriteCloser(rwc io.ReadWriteCloser, onRead, onWrite func(int64)) io.ReadWriteCloser {
+	if onRead == nil && onWrite == nil {
+		return rwc
+	}
+	return &countingReadWriteCloser{
+		ReadWriteCloser: rwc,
+		onRead:          onRead,
+		onWrite:         onWrite,
+	}
+}
+
+func (c *countingReadWriteCloser) Read(p []byte) (n int, err error) {
+	n, err = c.ReadWriteCloser.Read(p)
+	if n > 0 && c.onRead != nil {
+		c.onRead(int64(n))
+	}
+	return
+}
+
+func (c *countingReadWriteCloser) Write(p []byte) (n int, err error) {
+	n, err = c.ReadWriteCloser.Write(p)
+	if n > 0 && c.onWrite != nil {
+		c.onWrite(int64(n))
+	}
+	return
+}