fix client & server experimental fix

internal/hub.go

@@ -11,7 +11,7 @@ import (
 const (
 	writeWait  = 10 * time.Second
 	pongWait   = 60 * time.Second
-	pingPeriod = 55 * time.Second
+	pingPeriod = 25 * time.Second
 )
 
 type Client struct {
@@ -95,7 +95,7 @@ func WritePump(c *Client, h *Hub) {
 			}
 		case <-pingTicker.C:
 			c.Conn.SetWriteDeadline(time.Now().Add(writeWait))
-			if err := c.Conn.WriteMessage(websocket.PingMessage, nil); err != nil {
+			if err := c.Conn.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
 				return
 			}
 		}