A Simple app Using with Flask and Flask-SocketIO
see https://www.youtube.com/watch?v=RdSrkkrj3l4&index=61&list=PLXmMXHVSvS-CoYS177-UvMAQYRfL3fBtX
a simple example using Flask-SocketIO
see https://www.youtube.com/watch?v=RdSrkkrj3l4&index=61&list=PLXmMXHVSvS-CoYS177-UvMAQYRfL3fBtX
a simple example using Flask-SocketIO