rxjs/webSocket - 到“ws://localhost:3000/”的 WebSocket 连接失败：连接在收到握手响应之前关闭

Question

我已经在后端初始化了 WebSocket。
然后使用rxjs/webSocket连接，浏览器收到如下错误：

connection to 'ws://localhost:3000/' failed: Connection closed before receiving a handshake response

server.js 相关代码：

const { app, onServerInitialized } = require('./app');

const port = normalizePort(process.env.PORT);
console.log('Server is running on port ' + process.env.PORT);
app.set('port', port);

const server = http.createServer(app);
onServerInitialized(server);

app.js相关代码：

const app = express();

const onServerInitialized = server => {
    const io = socketio(server);

    io.on('connection', socket => {
        console.log('subscrie');
    });
};

module.exports = { app, onServerInitialized };

WebSocket服务

import { webSocket, WebSocketSubject } from 'rxjs/webSocket';

export class WebSocketService {
    private ws$: WebSocketSubject<any> = webSocket('ws://localhost:3000');

    public getWSListener() {
        return this.ws$.asObservable().pipe();
    }

    public sendMessage(message: string) {
        this.ws$.next({ message });
    }
}

app.component.ts

constructor(
  private webSocketService: WebSocketService,
) {}

ngOnInit() {
  this.webSocketService.getWSListener().subscribe(() => {
    console.log('event')
  });
}

Answer 1

您正在使用socket.io 包，并且此包的服务器设置在/socket.io 路径。所以试试这个 uri：ws://localhost:3000/socket.io/?EIO=3&transport=websocket

还要确保在onServerInitialized 函数中你不需要在底部添加这一行

io.listen(+process.env.PORT);

编辑：

最好使用ngx-socket-io 打包到 Angular 项目中