const proto  = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
const socket = new WebSocket(`${proto}//${window.location.host}/ws`);

socket.onopen = () => {
    console.log('Connected to server...');
    socket.send('world');
};

socket.onmessage = (e) => {
    console.log('Received message from server: ', e.data);
};