["python","django","django-views","django-settings","django-middleware"]
How to set up custom middleware in Django?

I'm trying to create a middleware to optionally pass a kwarg to every view that meets a condition. The problem is that I cannot find an example of how to set up the middleware. I have seen classes that override the method I want to, process_view: Class CheckConditionMiddleware(object): def process_view(self, request): return None But where do I put this class? Do I create a middleware app and put this class inside of it and then reference it in settings.middleware?
First: The path structure If you don't have it you need to create the middleware folder within your app following the structure: yourproject/yourapp/middleware The folder middleware should be placed in the same folder as settings.py, urls, templates... Important: Don't forget to create the init.py empty file inside the middleware folder so your app recognizes this folder Second: Create the middleware Now we should create a file for our custom middleware, in this example let's suppose we want a middleware that filter the users based on their IP, we create a file called filter_ip_middleware.py inside the middleware folder with this code: class FilterIPMiddleware(object): # Check if client IP is allowed def process_request(self, request): allowed_ips = ['192.168.1.1', '123.123.123.123', etc...] # Authorized ip's ip = request.META.get('REMOTE_ADDR') # Get client IP if ip not in allowed_ips: raise Http403 # If user is not allowed raise Error # If IP is allowed we don't do anything return None Third: Add the middleware in our 'settings.py' We need to look for: MIDDLEWARE_CLASSES (django < 1.10) MIDDLEWARE (django >= 1.10) Inside the settings.py we need to add our middleware (Add it in the last position). It should look like: MIDDLEWARE = ( # Before Django 1.10 the setting name was 'MIDDLEWARE_CLASSES' 'django.middleware.common.CommonMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', # Above are django standard middlewares # Now we add here our custom middleware 'yourapp.middleware.filter_ip_middleware.FilterIPMiddleware' ) Done! Now every request from every client will call your custom middleware and process your custom code!