websocket example connection error

i have confirmed that 1v96 works with espruino as the websocket client. i am still receiving an error when espruino is the server, using the example code, and i use this code in node.js

Error: Server sent a subprotocol but none was requested

const WebSocket = require('ws');
 
const ws = new WebSocket('ws://192.168.1.203:8000/', {
    protocol : "echo-protocol",
    protocolVersion: 13 });
 
ws.on('open', function open() {
  ws.send('something');
});

ws.on('error', function(err) {
    console.log(err);
})
 
ws.on('message', function incoming(data) {
  console.log(data);
});