How would you implement WebSocket communication in a Flask application?
Instruction: Describe the process of integrating WebSocket in Flask for real-time bidirectional communication between client and server.
Context: This question assesses the candidate's understanding of WebSocket technology and their ability to implement real-time communication in Flask applications, which is crucial for building dynamic and interactive web applications.
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Flask's normal interface is WSGI. For bidirectional communication, choose an integration and serving stack that support the required protocol. Flask-SocketIO implements Socket.IO, which has its own protocol and may use WebSocket or polling; a raw browser WebSocket client is not interchangeable with a Socket.IO client.
This Flask-SocketIO5 example provides a deliberately public bounded echo acknowledgment:...