Angular Universal has no or not understood support for WebSockets using express-ws

[xtianus79]

🐞 bug report

Angular Universal 9

Is this a regression?

NA

Description

When using websocket package that will create a websocket from the server to the client is not working starting from the server. The package I am using is express-ws
Is there any way to get websockets working with Angular Universal?

🔬 Minimal Reproduction

Here is my code
I am at a complete loss, as to what is going on, so I will post the Angular Universal server code that is running my express server.

I think there is something within Angular Unviersal's render engine that is completely just blocking websockets.

No configuration or anything I do can resolve the websocket without getting the:

'ws://localhost:4201/echo' failed: Connection closed before receiving a handshake response

// The Express app is exported so that it can be used by serverless Functions.
export function app() {
  const server = express();
  const distFolder = join(process.cwd(), 'dist/ai-ggggg-frontend-website/browser');
  const indexHtml = existsSync(join(distFolder, 'index.original.html')) ? 'index.original.html' : 'index';
  
  server.use('/swagger/api-docs', express.static('./dist/ai-heagggggd-website/browser/swagger'));

  // Our Universal express-engine (found @ https://github.com/angular/universal/tree/master/modules/express-engine)
  server.engine('html', ngExpressEngine({
    bootstrap: AppServerModule,
  }));

  server.set('view engine', 'html');
  server.set('views', distFolder);

  // Example Express Rest API endpoints
  // server.get('/api/**', (req, res) => { });
  // Serve static files from /browser
  server.get('*.*', express.static(distFolder, {
    maxAge: '1y'
  }));

  // All regular routes use the Universal engine
  server.get('*', (req, res) => {
    res.render(indexHtml, { req, providers: [{ provide: APP_BASE_HREF, useValue: req.baseUrl }] });
  });

  return server;
}

function run() {
  const port = process.env.PORT || 4000;

  // Start up the Node server
  const server = app();

  server.listen(port, () => {
    console.log(`Node Express server listening on http://localhost:${port}`);
  });
}

// Webpack will replace 'require' with '__webpack_require__'
// '__non_webpack_require__' is a proxy to Node 'require'
// The below code is to ensure that the server is run only when not requiring the bundle.
declare const __non_webpack_require__: NodeRequire;
const mainModule = __non_webpack_require__.main;
const moduleFilename = mainModule && mainModule.filename || '';
if (moduleFilename === __filename || moduleFilename.includes('iisnode')) {
  run();
}

export * from './src/main.server';

🔥 Exception or Error

🌍 Your Environment

Angular Version:

Anything else relevant?

[CaerusKaru]

Duplicate of #846

[xtianus79]

@CaerusKaru I am going through that thread and I don't see an adequate answer. Or I am missing something entirely. Is there a viable solution to this. Which answer has a notable solution in that thread

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