Flask 安装 Flask-Socketio

Flask-SocketIO 第三方库使 Flask 应用程序可以实现客户端和服务器之间的低延迟双向通信。客户端应用程序可以使用 Javascript、Python、C++、Java 和 Swift 中的任何 SocketIO 客户端库或任何其他兼容客户端来建立与服务器的永久连接。

Flask-Socketio 官方文档网站

网站地址：https://flask-socketio.readthedocs.io/en/latest/

初始化源码

from flask import Flask, request
from flask_socketio import SocketIOapp = Flask(__name__)from flask_cors import *
CORS(app, supports_credentials=True)app.config['SECRET_KEY'] = 'EDGEHACKER520!'socketio = SocketIO(app, cors_allowed_origins='*')name_space = '/echo'@socketio.on('connect', namespace=name_space)
def champion_connect():print(request)return True@socketio.on('disconnect', namespace=name_space)
def champion_disconnect():passif __name__ == '__main__':print("启动成功")socketio.run(app, host='0.0.0.0', port=3000, debug=False)

常见报错：[2024-03-23 17:15:53,830] WARNING in __init__: WebSocket transport not available. Install gevent-websocket for improved performance.

报错解决方案

pip install gevent-websocket

前端 socket.io-client 客户端

npm install socket.io-client

客户端连接案例源码

import io from 'socket.io-client';  export default {data() {return {socket: null};},mounted() {this.socket = io.connect('ws://localhost:3000/echo?uid=helloworld', {timeout: 300000, reconnectionDelayMax: 1000, reconnectionDelay: 500})}
}

服务器端读取连接请求

@socketio.on('connect', namespace=champion_space)
def champion_connect():print(request.args)return True

ImmutableMultiDict([('uid', 'helloworld'), ('EIO', '4'), ('transport', 'polling'), ('t', 'OvhXJvg')])