NodeJS - Establish a Connection WebSocket with protocol HTTPS - node.js

Question

I have a problem with an HTTPS and a WebSocket connection (I use Node.JS as a server).
I have generated SSL certificates with OpenSSL and I imported them to the server with the following code:
const https = require('https');
var app = express();
...
const WebSocket = require('ws');
...
var serverHttps = https.createServer({
key: fs.readFileSync(path.join(pathCertificati, 'key.pem')),
cert: fs.readFileSync(path.join(pathCertificati, 'cert.pem'))
}, app).listen(3000, () => {
console.log('In ascolto sulla porta 3000 HTTPS.')
})
const wss = new WebSocket.Server({
server: serverHttps,
adress: '192.168.12.40',
port: 9000
});
With this code I should have a WebSocket handling an HTTPS connection, correct?
Client side, I have the following code:
socket = new WebSocket("wss://192.168.12.40:9000");
socket.onopen = function ()...
socket.onclose = function ()...
socket.onerror = function (error) {
console.log("Errore nella connessione!");
console.log(error);
}
When I load the page using the address: https://192.168.12.40:3000 and the above code is executed, the error message appears:
WebSocketScript.js:26 WebSocket connection to 'wss://192.168.12.40:9000/' failed: Error in connection establishment: net::ERR_SSL_PROTOCOL_ERROR
Do you have any ideas to establish the WebSocket Connection on an HTTPS page?
Thanks a lot.

Answer 1

I have found the solution to the problem. The solution is:
Server-side code:
var serverHttps = https.createServer({
key: fs.readFileSync(path.join(pathCertificati, 'key.pem')),
cert: fs.readFileSync(path.join(pathCertificati, 'cert.pem'))
}, app).listen(3000, () => {
// Messaggio di attivazione del server in ascolto sulla porta 3000
console.log('Listening ' + 3000 + ' HTTPS.');
})
serverHttps.on('upgrade', function upgrade(request, socket, head) {
const pathname = url.parse(request.url).pathname;
if (pathname === "/") {
wss.handleUpgrade(request, socket, head, function done(ws) {
wss.emit('connection', ws, request);
});
}
});
// Create WebSocket
const wss = new WebSocket.Server({ noServer: true });
wss.on('error', function () {...}
wss.on('connection', function (ws) {...}
Client side:
socket = new WebSocket("wss://192.168.12.40:3000);
This is the same address used on the server side and it fire the event "serverHttps.on('upgrade'"
Thanks a log...