django/contrib/flatpages/middleware.py


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from django.contrib.flatpages.views import flatpage
from django.http import Http404
from django.conf import settings

class FlatpageFallbackMiddleware:
    def process_response(self, request, response):
        if response.status_code != 404:
            return response # No need to check for a flatpage for non-404 responses.
        try:
            return flatpage(request, request.path)
        # Return the original response if any errors happened. Because this
        # is a middleware, we can't assume the errors will be caught elsewhere.
        except Http404:
            return response
        except:
            if settings.DEBUG:
                raise
            return response