Socket.io-client: Socket.io - 클라이언트 3.0.0+ 재연결 이벤트 모두 실패

Socket.io - 클라이언트 3.0.0+ 재연결 이벤트가 모두 실패했습니다.

버전 2.3.1로 전환하면 작동합니다.

const io = require('socket.io-client');

let socket = io.connect('ws://127.0.0.1:8000', {
    "transports": ['websocket', 'polling'],
    reconnection: true
});
socket.on('connect', function(data){
    onlineFlag = true;
    console.log(data + ' - connect');
});
socket.on('connect_error', function(data){
    console.log(data + ' - connect_error');
});
socket.on('connect_timeout', function(data){
    console.log(data + ' - connect_timeout');
});
socket.on('error', function(data){
    console.log(data + ' - error');
});
socket.on('disconnect', function(data){
    onlineFlag = false;
    console.log(data + ' - disconnect');
});
socket.on('reconnect', function(data){
    console.log(data + ' - reconnect');
});
socket.on('reconnect_attempt', function(data){
    console.log(data + ' - reconnect_attempt');
});
socket.on('reconnecting', function(data){
    console.log(data + ' - reconnecting');
});
socket.on('reconnect_error', function(data){
    console.log(data + ' - reconnect_error');
});
socket.on('reconnect_failed', function(data){
    console.log(data + ' - reconnect_failed');
});
socket.on('ping', function(data){
    console.log(data + ' - ping');
});
socket.on('pong', function(data){
    console.log(data + ' - pong');
});