Chapter 3

1. We can create and configure an instance of RequestParser. We use this instance in our controller's handler methods such as .get() or .post() to validate the client's request.
2. WebSockets – a client and server built using Web Sockets can initiate a request to one another in either direction. This is in contrast to a RESTful API service where only the client can initiate a request to the server.
3. Flask-SocketIO does not include an in-built validation class like Flask-RESTful. You have to perform input validation manually. Alternatively, you could also find a suitable third-party Python module to use from PyPi.org.
4. The templates folder is the default location where the Flask framework looks for template files. It's in this location where we store our HTML pages and templates.
5. We should initialize event listeners and the web page content in the document ready function, which is called once the web page has...