Flask normally is not wrapped in a class but sometimes we want to encapsulate the server and provide extra functionality like broadcasting websockets with other app logic modules.

Make sure pyenv and pipenv is installed to re-create v3.7.1 and to re-install the project dependencies. Run the project with the following commands

pipenv shell
python __main__py

Flask doesn't call separate routers a middleware, it refers to it as a blueprint to logically separate endpoints.