Vuejs socket io transport type

Question

I changed socket io transport type as websocket on server side to use it with multiple pods on Kubernetes. However client side try to request with transport polling type. On the client side I used vue-socket.io package and the implementation :

Vue.use(new VueSocketIO({
  debug: false,
  connection: socketConnection,
  vuex: {
    store,
    actionPrefix: 'SOCKET_',
    mutationPrefix: 'SOCKET_',
  },
  options: { transports: ['websocket'], path: '/' },
}))

However, Client did not change the transport type as websocket, the url example is http://localhost:6164/socket.io/?EIO=4&transport=polling&t=N_qVTMh