Creating custom middleware

Custom Django middleware should be used to execute code that we want to run for all the requests/responses. For example, we want to add a custom header to all the requests/responses, or we want to add logging or monitoring for requests. In Chapter 6, we learned how to use custom middleware to add get user_id for each request for logging. In this section, we will learn about the core concepts of custom middleware in Django.

Let us now check how to create a custom middleware in Django:

1. Create a file called custom_middleware.py (any other name can also be given). Add the following code to the common/custom_middleware.py file:

   class CustomMiddleware:
       def __init__(self, get_response):
         self.get_response = get_response
       def __call__(self, request):
         print("custom middleware before request view")
        ...