[4.2.x] Refs #34482 -- Reverted "Fixed #32969 -- Fixed pickling HttpResponse and subclasses."

This reverts commit d7f5bfd241.

Thanks Márton Salomváry for the report.

Backport of 173034b005 from main

django/http/response.py

@@ -369,31 +369,12 @@ class HttpResponse(HttpResponseBase):
     """
 
     streaming = False
-    non_picklable_attrs = frozenset(
-        [
-            "resolver_match",
-            # Non-picklable attributes added by test clients.
-            "asgi_request",
-            "client",
-            "context",
-            "json",
-            "templates",
-            "wsgi_request",
-        ]
-    )
 
     def __init__(self, content=b"", *args, **kwargs):
         super().__init__(*args, **kwargs)
         # Content is a bytestring. See the `content` property methods.
         self.content = content
 
-    def __getstate__(self):
-        obj_dict = self.__dict__.copy()
-        for attr in self.non_picklable_attrs:
-            if attr in obj_dict:
-                del obj_dict[attr]
-        return obj_dict
-
     def __repr__(self):
         return "<%(cls)s status_code=%(status_code)d%(content_type)s>" % {
             "cls": self.__class__.__name__,

django/template/response.py

@@ -8,9 +8,7 @@ class ContentNotRenderedError(Exception):
 
 
 class SimpleTemplateResponse(HttpResponse):
-    non_picklable_attrs = HttpResponse.non_picklable_attrs | frozenset(
-        ["template_name", "context_data", "_post_render_callbacks"]
-    )
+    rendering_attrs = ["template_name", "context_data", "_post_render_callbacks"]
 
     def __init__(
         self,
@@ -57,11 +55,16 @@ class SimpleTemplateResponse(HttpResponse):
         Raise an exception if trying to pickle an unrendered response. Pickle
         only rendered data, not the data used to construct the response.
         """
+        obj_dict = self.__dict__.copy()
         if not self._is_rendered:
             raise ContentNotRenderedError(
                 "The response content must be rendered before it can be pickled."
             )
-        return super().__getstate__()
+        for attr in self.rendering_attrs:
+            if attr in obj_dict:
+                del obj_dict[attr]
+
+        return obj_dict
 
     def resolve_template(self, template):
         """Accept a template object, path-to-template, or list of paths."""
@@ -142,9 +145,7 @@ class SimpleTemplateResponse(HttpResponse):
 
 
 class TemplateResponse(SimpleTemplateResponse):
-    non_picklable_attrs = SimpleTemplateResponse.non_picklable_attrs | frozenset(
-        ["_request"]
-    )
+    rendering_attrs = SimpleTemplateResponse.rendering_attrs + ["_request"]
 
     def __init__(
         self,

docs/releases/4.2.1.txt

@@ -31,5 +31,5 @@ Bugfixes
   language was used (:ticket:`34455`).
 
 * Fixed a regression in Django 4.2 where creating copies and deep copies of
-  ``HttpRequest`` and its subclasses didn't always work correctly
-  (:ticket:`34482`, :ticket:`34484`).
+  ``HttpRequest``, ``HttpResponse``, and their subclasses didn't always work
+  correctly (:ticket:`34482`, :ticket:`34484`).

docs/releases/4.2.txt

@@ -416,9 +416,6 @@ fields modified in the custom ``save()`` methods should be added to the
 Miscellaneous
 -------------
 
-* The undocumented ``SimpleTemplateResponse.rendering_attrs`` and
-  ``TemplateResponse.rendering_attrs`` are renamed to ``non_picklable_attrs``.
-
 * The undocumented ``django.http.multipartparser.parse_header()`` function is
   removed. Use ``django.utils.http.parse_header_parameters()`` instead.
 

tests/test_client/tests.py

@@ -19,8 +19,8 @@ testing against the contexts and templates produced by a view,
 rather than the HTML rendered to the end-user.
 
 """
+import copy
 import itertools
-import pickle
 import tempfile
 from unittest import mock
 
@@ -81,20 +81,24 @@ class ClientTest(TestCase):
         self.assertEqual(response.context["var"], "\xf2")
         self.assertEqual(response.templates[0].name, "GET Template")
 
-    def test_pickling_response(self):
+    def test_copy_response(self):
         tests = ["/cbv_view/", "/get_view/"]
         for url in tests:
             with self.subTest(url=url):
                 response = self.client.get(url)
-                dump = pickle.dumps(response)
-                response_from_pickle = pickle.loads(dump)
-                self.assertEqual(repr(response), repr(response_from_pickle))
+                response_copy = copy.copy(response)
+                self.assertEqual(repr(response), repr(response_copy))
+                self.assertIs(response_copy.client, response.client)
+                self.assertIs(response_copy.resolver_match, response.resolver_match)
+                self.assertIs(response_copy.wsgi_request, response.wsgi_request)
 
-    async def test_pickling_response_async(self):
+    async def test_copy_response_async(self):
         response = await self.async_client.get("/async_get_view/")
-        dump = pickle.dumps(response)
-        response_from_pickle = pickle.loads(dump)
-        self.assertEqual(repr(response), repr(response_from_pickle))
+        response_copy = copy.copy(response)
+        self.assertEqual(repr(response), repr(response_copy))
+        self.assertIs(response_copy.client, response.client)
+        self.assertIs(response_copy.resolver_match, response.resolver_match)
+        self.assertIs(response_copy.asgi_request, response.asgi_request)
 
     def test_query_string_encoding(self):
         # WSGI requires latin-1 encoded strings.