STOMP mock server with Angular

Question

I've an Angular app that successfully commnunicate with on a STOMP Websocket provided by a Springboot server. For some reasons, I need to have a mock server to be able to run Angular without the springboot server. I tried diffferents solutions but I cant get it to work. Currently, I'm using "stomp-broker-js" but as soon as the client try to connect it crash. I don't want to change the Angular code cause it works well with the real server.

Here's my mock server code:

const http = require("http");
const StompServer = require("stomp-broker-js");
const node_static = require("node-static");
const static_directory = new node_static.Server(__dirname);

const server = http.createServer((request, response) => {
  console.log(request.url);
  static_directory.serve(request, response);
});
const stompServer = new StompServer({
  server: server,
  debug: console.log,
  path: "/updates",
  protocol: "sockjs",
  heartbeat: [2000, 2000],
});

console.log(" [*] Listening on 0.0.0.0:3000");
server.listen(3000, "localhost");

stompServer.subscribe("/echo", (msg, headers) => {
  var topic = headers.destination;
  console.log(`topic:${topic} messageType: ${typeof msg}`, msg, headers);
  stompServer.send("/echo", headers, `Hello from server! ${msg}`);
});

Here's the log:

node MobiusStompWSMockServer.js
SockJS v0.3.24 bound to "/updates"
 [*] Listening on 0.0.0.0:3000
GET /updates 1ms (unfinished)
node:events:368
      throw er; // Unhandled 'error' event
      ^

Error: read ECONNRESET
    at TCP.onStreamRead (node:internal/stream_base_commons:220:20)
Emitted 'error' event on Socket instance at:
    at emitErrorNT (node:internal/streams/destroy:157:8)
    at emitErrorCloseNT (node:internal/streams/destroy:122:3)
    at processTicksAndRejections (node:internal/process/task_queues:83:21) {
  errno: -4077,
  code: 'ECONNRESET',
  syscall: 'read'
}

And in the client side, it crash in client.js:

The network shows "connection: upgrade" and the server shows "unfinished".

For the angular part, I used "rx-stomp", exactly like indicated in https://stomp-js.github.io/guide/rx-stomp/rx-stomp-with-angular.html.

Does someone have an idea or have succesfully mock a spring boot stomp websocket?

Thanks for your help!