增加WebSocket的ping包

cmd/dashboard/controller/common_page.go

@@ -185,6 +185,7 @@ func (cp *commonPage) ws(c *gin.Context) {
 		return
 	}
 	defer conn.Close()
+	count := 0
 	for {
 		dao.SortedServerLock.RLock()
 		err = conn.WriteJSON(dao.SortedServerList)
@@ -192,6 +193,10 @@ func (cp *commonPage) ws(c *gin.Context) {
 		if err != nil {
 			break
 		}
+		count += 1
+		if count%4 == 0 {
+			conn.WriteMessage(websocket.PingMessage, []byte{})
+		}
 		time.Sleep(time.Second * 2)
 	}
 }