客户端 WebSocket 连接失败

问：

我正在开发 ReactJS 聊天应用程序 当我尝试连接到节点服务器时，我在控制台中收到连接失败的错误

这是客户端应用This is the Client side app

import { Component } from 'react';
import ReactDOM from 'react-dom';

import { w3cwebsocket as W3CWebSocket } from 'websocket';

const client = new W3CWebSocket('ws://127.0.0.1:8000');

export default class App extends Component {
  onButtonClick(message) {
    client.send(
      JSON.stringify({
        type: 'message',
        msg: message,
      })
    );
  }
  componentDidMount() {
    client.onopen = () => {
      console.log('WebSocket Client Connected');
    };

    client.onmessage = message => {
      const dataFromServer = JSON.parse(message.data);
      console.log('Got Reply : ' + dataFromServer);
    };
  }

  render() {
    return (
      <div>
        <button
          onClick={() => {
            this.onButtonClick('Hello');
          }}
        >
          Send Message
        </button>
      </div>
    );
  }
}

ReactDOM.render(<App />, document.getElementById('root'));

这是我遇到的错误

错误消息

这是服务器端应用程序

const webSocketServerPort = 8000;

const webSocketServer = require("websocket").server;

const http = require("http");

const server = http.createServer();
server.listen(webSocketServerPort, () => {
  console.log(`WebSocket server is running on port ${webSocketServerPort}`);
});

const wsServer = new webSocketServer({
  httpServer: server,
});

const clients = {};

function getUniqueID() {
  return Math.floor(Math.random() * 1000000);
}

wsServer.on("request", (request) => {
  var userID = getUniqueID();
  console.log(
    new Date() +
      " Recieved a new connection from origin " +
      request.origin +
      "."
  );

  const connection = request.accept(null, request.origin);

  clients[userID] = connection;

  console.log(
    "connected: " + userID + " in " + Object.getOwnPropertyNames(clients)
  );

  connection.on("message", (message) => {
    if (message.type === "utf8") {
      console.log("Recieved Message: " + message.utf8Data);

      for (key in clients) {
        clients[key].sendUTF(message.utf8Data);
        console.log("sent Message to: " + clients[key]);
      }
    }
  });
});

根据我遵循的教程，它应该连接成功，但我不知道问题出在哪里