我目前有一个angular 2+应用程序运行socket.io-client，还有一个服务器使用python和flask socketio。问题是我设法在两者之间建立了连接，客户端收到了connect事件（用on（'connect'）处理）。。但是，我的服务器端不接收connect事件（但是接收从客户端手动发出的其他事件）。
客户：

import { Injectable } from '@angular/core';
import { io, Socket } from 'socket.io-client';

@Injectable({
  providedIn: 'root'
})
export class IoDataService {
  private socket: Socket; 

  constructor() {
    this.socket = io('http://127.0.0.1:5000', {transports:['websocket']});

    this.socket.on('connect_failed', (data: Object) => {console.log(data)})
    this.socket.on('error', (data: Object) => {console.log(data)})
    this.socket.on('connect', () => {console.log(`connect`)})
 }
...

服务器：

class MainWebApi(metaclass=Singleton):
    logger = logging.getLogger('TraderWebApi')
    namespace = '/'

    def __init__(self):
        self.app = Flask(__name__)
        self.app.debug = False
        self.app.config['SECRET_KEY'] = 'secret!'
        self.socketio = SocketIO(self.app, cors_allowed_origins="*", async_handlers=True)
        self.initialize_handlers()
        self.is_started = False
        self.nb_connected = 0

    def start(self):
        self.socketio.run(self.app, log_output=True)
        self.is_started = True

    def emit(self, event_name: str, data: dict, namespace: str=None):
        if self.nb_connected > 0:
            self.socketio.emit(event_name, data, namespace=namespace or self.namespace)

    def on_connect(self):
        self.nb_connected += 1
        self.logger.info(f'New client connected (total {self.nb_connected})')

    def on_disconnect(self):
        self.nb_connected += 1
        self.logger.info(f'New client connected (total {self.nb_connected})')

    def subscribe_listener(self, event_name: str, method: Callable, namespace: str=None):
        self.socketio.on(event_name, namespace=namespace or self.namespace)(method)

    def initialize_handlers(self):
        self.subscribe_listener('connect', self.on_connect)
        self.subscribe_listener('disconnect', self.on_disconnect)