Node.js: IP generated from my web hosting domain is "not available" (can't setup a https server)

I'm creating a brutally simple HTTPS server on render.com using Node.js, which upgrades to WebSocket communication. Here's the code:

    const https = require('https');
    
    // Create an HTTP server
    const server = https.createServer((req, res) => {
      res.writeHead(200, { 'Content-Type': 'text/plain' });
      res.end('okay');
    });
    server.on('upgrade', (req, socket, head) => {
      socket.write('HTTP/1.1 101 Web Socket Protocol Handshake\r\n' +
                   'Upgrade: WebSocket\r\n' +
                   'Connection: Upgrade\r\n' +
                   '\r\n');
    
      socket.pipe(socket); // echo back
    });
    
    // Now that server is running
    server.listen(443, 'test-srv-676.onrender.com', () => {
    
      // make a request
      const options = {
        port: 443,
        Host: 'test-srv-676.onrender.com',
        headers: {
          'Connection': 'Upgrade',
          'Upgrade': 'websocket',
        },
      };

  const req = http.request(options);
  req.end();

  req.on('upgrade', (res, socket, upgradeHead) => {
    console.log('got upgraded!');
    socket.end();
  });
}); 

Instantly, I get an error: the server tries to listen at an IP generated from domain 'test-srv-676.onrender.com', but it is "not available". My HTTPS server setup might be faulty, but I don't know. The error thrown is:

Starting service with 'node server.js'
May 22 09:03:18 AM  events.js:353
May 22 09:03:18 AM        throw er; // Unhandled 'error' event
May 22 09:03:18 AM        ^
May 22 09:03:18 AM  
May 22 09:03:18 AM  Error: listen EADDRNOTAVAIL: address not available 216.24.57.3:443
May 22 09:03:18 AM      at Server.setupListenHandle [as _listen2] (net.js:1301:21)
May 22 09:03:18 AM      at listenInCluster (net.js:1366:12)
May 22 09:03:18 AM      at doListen (net.js:1503:7)
May 22 09:03:18 AM      at processTicksAndRejections (internal/process/task_queues.js:83:21)
May 22 09:03:18 AM  Emitted 'error' event on Server instance at:
May 22 09:03:18 AM      at emitErrorNT (net.js:1345:8)
May 22 09:03:18 AM      at processTicksAndRejections (internal/process/task_queues.js:82:21) {
May 22 09:03:18 AM    code: 'EADDRNOTAVAIL',
May 22 09:03:18 AM    errno: -99,
May 22 09:03:18 AM    syscall: 'listen',
May 22 09:03:18 AM    address: '216.24.57.3',
May 22 09:03:18 AM    port: 443
May 22 09:03:18 AM  }

The server is most probably using a floating IP address that is not directly configured on the server, but instead routed to the actual internal address of your server.

Check the actual IP address of your server or bind to 0.0.0.0 to bind to all interfaces.