Node.js HTTPS Server with certificate generator

// https://github.com/digitalbazaar/forge#x509
// npm install node-forge
// https://127.0.0.1:443

const https = require('https')
        , forge = require('node-forge');

// Generate certificate

const keyPair = forge.pki.rsa.generateKeyPair(2048)
        , cert = forge.pki.createCertificate()
        , now = new Date()
        , oneYear = new Date(new Date(now).setFullYear(now.getFullYear() + 1));

Object.assign(cert, {
      publicKey: keyPair.publicKey
    , serialNumber: '01'
    , validity: {
          notBefore: now
        , notAfter: oneYear
    }
});

cert.sign(keyPair.privateKey, forge.md.sha256.create()); // self signed

const serverPrivateKeyPem = forge.pki.privateKeyToPem(keyPair.privateKey)
        , serverPublicKeyPem = forge.pki.publicKeyToPem(keyPair.publicKey)
        , serverCertificatePem = forge.pki.certificateToPem(cert);

// Server

const serverOptions = {
      key: serverPrivateKeyPem
    , cert: serverCertificatePem
};

const server = https.createServer(serverOptions, function (request, response) {
    response.writeHead(200, 'OK', {'Content-Type': 'text/plain'});
    response.end('Hello World!');
})

server.listen(443, '127.0.0.1', function () {
    console.log('Server started at https://127.0.0.1:443');
});

// Client

const clientOptions = {
      hostname: '127.0.0.1'
    , port: 443
    , path: '/'
    , method: 'GET'
    , rejectUnauthorized: false // don't check certificate
    , requestCert: true
    , agent: false
};

const client = https.request(clientOptions, function (response) {
    response.on('data', function (data) {
        console.log(data.toString());
    });
    response.on('end', function () {
        server.close();
    });
});

client.on('error', function (error) {
    throw error;
});

client.end();