//...
const proxyOptions = {
    agent: {
        // create a new HttpsProxyAgent instance
        https: new HttpsProxyAgent({
            // add proxy settings
            keepAlive: true,
            keepAliveMsecs: 1000,
            maxSockets: 256,
            maxFreeSockets: 256,
            scheduling: 'lifo',
            // specify proxy URL.
            proxy: getRandomProxy()
        })
    }
};