Django raising 404 with a message

Question

I like to raise 404 with some error message at different places in the script eg: Http404(\"some error msg: %s\" %msg) So, in my urls.py I included:

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Answer 1

I figured out a solution for Django 2.2 (2019) after a lot of the middleware changed. It is very similar to Muhammed's answer from 2013. So here it is:

middleware.py

from django.http import Http404, HttpResponse

class CustomHTTP404Middleware:
    def __init__(self, get_response):
        self.get_response = get_response
        # One-time configuration and initialization.

    def __call__(self, request):
        # Code to be executed for each request before the view (and later middleware) are called.
        response = self.get_response(request)
        # Code to be executed for each request/response after the view is called.
        return response

    def process_exception(self, request, exception):
        if isinstance(exception, Http404):
            message = f"""
                {exception.args},
                User: {request.user},
                Referrer: {request.META.get('HTTP_REFERRER', 'no referrer')}
            """
            exception.args = (message,)

Also, add this last to your middleware in settings.py: 'app.middleware.http404.CustomHTTP404Middleware',