How to use custom websockets[BUG]

[13100967125]

app := iris.New()
appRouter := app.Party("/api")
appRouter.PartyFunc("/record", func(request router.Party) {
        request.Any("/ws", hero.Handler(newRecordHandler.Ws))
})

var upgrader = websocket.Upgrader{
	ReadBufferSize:  10240,
	WriteBufferSize: 10240,
	CheckOrigin: func(r *http.Request) bool {
		return true
	},
}
func (r *RecordHandler) Ws(ctx iris.Context) {
  conn, _:= upgrader.Upgrade(ctx.ResponseWriter(), ctx.Request(), nil)
 
go func(){
   err := conn.WriteMessage(websocket.TextMessage,[]byte("ok"))
  //[HTTP Server] http: response.Write on hijacked connection from github.com/kataras/iris/v12/context.(*responseWriter).Write (response_writer.go:276)???
}()
for {
       _, message, err := conn.ReadMessage()
      //close 1006 (abnormal closure): unexpected EOF ????
 }
}

How can I make it work properly