Not works in express-generator app context

[baur]

Not works in express-generator app context!

Server code

...
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var app = express();

const { proxy } = require('rtsp-relay')(app);
const handler = proxy({
  url: `rtsp://user:[email protected]:554/ISAPI/Streaming/Channels/102`,
  verbose: true,
});
app.ws('/api/stream/1', handler);
...

client

...
<div class="card border-secondary bg-secondary m-0 p-0 m-0 p-0" style="width: 372px;">
      <canvas id='canvas1' style="width:372px;height:218px"></canvas>
</div>
<script>
    new JSMpeg.Player('ws://' + location.host + '/api/stream/1', {
      canvas: document.getElementById('canvas1'),audio:false,disableGl:true,disableWebAssembly: true
    })
</script>
...

start

> [email protected] start C:\node\jsipcamera
> node ./bin/www

node console

GET /api/stream/1 404 101.712 ms - 2937
GET /api/stream/1 404 9.757 ms - 2937

browser console
jsmpeg.min.js:1 WebSocket connection to 'ws://localhost:3003/api/stream/1' failed: Error during WebSocket handshake: Unexpected response code: 404

what am i doing wrong?

[baur]

works if commet this part of code

var server = http.createServer(app);
server.listen(port);
server.on('error', onError);
server.on('listening', onListening);

and type insead of
app.listen(2000);