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venv/Lib/site-packages/django/contrib/messages/middleware.py

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+from django.conf import settings
+from django.contrib.messages.storage import default_storage
+from django.utils.deprecation import MiddlewareMixin
+
+
+class MessageMiddleware(MiddlewareMixin):
+    """
+    Middleware that handles temporary messages.
+    """
+
+    def process_request(self, request):
+        request._messages = default_storage(request)
+
+    def process_response(self, request, response):
+        """
+        Update the storage backend (i.e., save the messages).
+
+        Raise ValueError if not all messages could be stored and DEBUG is True.
+        """
+        # A higher middleware layer may return a request which does not contain
+        # messages storage, so make no assumption that it will be there.
+        if hasattr(request, '_messages'):
+            unstored_messages = request._messages.update(response)
+            if unstored_messages and settings.DEBUG:
+                raise ValueError('Not all temporary messages could be stored.')
+        return response