How is an intermediate layer implemented in the Django framework that ensures request and response processing?

In Django, middleware is implemented through the middleware mechanism — these are classes that process HTTP requests and responses.

Middleware are arranged in a chain, and each can:

• modify or process the incoming request before passing it further down the chain to views;
• process the response before sending it to the client;
• interrupt processing and return a response immediately.

Example of simple middleware:

from django.utils.deprecation import MiddlewareMixin

class SimpleMiddleware(MiddlewareMixin):
    def process_request(self, request):
        print('Processing request')

    def process_response(self, request, response):
        print('Processing response')
        return response

Middleware are registered in the project settings in the MIDDLEWARE list, and Django sequentially calls their methods during each request and response processing.