Fixed #19262 -- Support cookie pickling in SimpleTemplateResponse

Refs #15863.

django/template/response.py

@@ -40,7 +40,7 @@ def __getstate__(self):
         rendered, and that the pickled state only includes rendered
         data, not the data used to construct the response.
         """
-        obj_dict = self.__dict__.copy()
+        obj_dict = super(SimpleTemplateResponse, self).__getstate__()
         if not self._is_rendered:
             raise ContentNotRenderedError('The response content must be '
                                           'rendered before it can be pickled.')

tests/regressiontests/templates/response.py

@@ -189,6 +189,21 @@ def test_repickling(self):
         unpickled_response = pickle.loads(pickled_response)
         repickled_response = pickle.dumps(unpickled_response)
 
+    def test_pickling_cookie(self):
+        response = SimpleTemplateResponse('first/test.html', {
+                'value': 123,
+                'fn': datetime.now,
+            })
+
+        response.cookies['key'] = 'value'
+
+        response.render()
+        pickled_response = pickle.dumps(response, pickle.HIGHEST_PROTOCOL)
+        unpickled_response = pickle.loads(pickled_response)
+
+        self.assertEqual(unpickled_response.cookies['key'].value, 'value')
+
+
 @override_settings(
     TEMPLATE_CONTEXT_PROCESSORS=[test_processor_name],
     TEMPLATE_DIRS=(os.path.join(os.path.dirname(__file__),'templates')),