Minor cleanup of JavaScript code

}

function updateRooms() {

    // Configure a different API URL here if desired

    const api_url = '/api/rooms';

    var request = new XMLHttpRequest();

    request.open('GET', '/api/rooms', true);

    request.open('GET', api_url, true);

    request.onload = function () {

        if (request.status >= 200 && request.status < 400) {

            var rooms = JSON.parse(this.response);

    playing_room = null;

}

function connectWebsocket() {

function getWebSocketUrl() {

    var scheme;

    var port;

    // Configure a different WebSocket server here if desired

    if (window.location.protocol == 'https:') {

        scheme = 'wss:';

        port = 443;

    } else if (window.location.protocol == 'http:') {

        scheme = 'ws:';

        port = 80;

    }

    const server = window.location.hostname;

    const port = window.location.port || 80;

    port = window.location.port || port;

    const ws_url = scheme + '//' + server + ':' + port + '/ws/subscribe';

    const ws = new WebSocket(ws_url);

    return ws_url;

}

function connectWebsocket() {

    const ws = new WebSocket(getWebSocketUrl());

    ws.addEventListener('open', (event) => onServerOpen(ws, event));

    ws.addEventListener('error', (event) => onServerError(ws, event));

        return;

    }

    console.log('Opened');

    // Now join the room, at this point we will start getting messages

    websocket.send(JSON.stringify({

        'joinroom': {