使用flask_socketio构建的服务端应用
$ pip install Flask
$ pip install flask-socketio
$ pip install eventlet
$ pip install gunicorn # 要求 python 3.x >= 3.4
在服务器上执行 start.sh 文件
sh ./start.sh
https://docs.gunicorn.org/en/stable/install.html
https://flask-socketio.readthedocs.io/en/latest/#emitting-from-an-external-process
https://dormousehole.readthedocs.io/en/latest/installation.html#flask