[Django] #35133: never_cache decorator problem with async get function inside classbased View

[Django]

#35133: never_cache decorator problem with async get function inside classbased
View
-------------------------------------+-------------------------------------
               Reporter:             |          Owner:  nobody
  unnamedtrue                        |
                   Type:  Bug        |         Status:  new
              Component:  Core       |        Version:  5.0
  (Cache system)                     |       Keywords:  never_cache,
               Severity:  Normal     |  decorator, async, classnased view,
           Triage Stage:             |  dispatch, coroutine
  Unreviewed                         |      Has patch:  0
    Needs documentation:  0          |    Needs tests:  0
Patch needs improvement:  0          |  Easy pickings:  0
                  UI/UX:  0          |
-------------------------------------+-------------------------------------
 If I use never_cache decorator for my classbased View I get this error:
 "'coroutine' object has no attribute 'has_header'"
 Code is:
 {{{
 @method_decorator(never_cache, name="dispatch")
 class CheckAsync(View):
     async def get(self, request, *args, **kwargs):
         # Perform io-blocking view logic using await, sleep for example.
         await asyncio.sleep(1)
         return HttpResponse("Hello async world!")
 }}}
 Debug info:
 {{{
 Request Method: GET
 Request URL: http://127.0.0.1:8000/api/asynccheck/

 Django Version: 5.0.1
 Python Version: 3.12.1
 Installed Applications:
 ['core.apps.AdminConfig',
  'django.contrib.sites',
  'django.contrib.auth',
  'django.contrib.contenttypes',
  'django.contrib.sessions',
  'django.contrib.messages',
  'django.contrib.staticfiles',
  'api.apps.ApiAppConfig',
 ]
 Installed Middleware:
 ['django.middleware.security.SecurityMiddleware',
  'django.contrib.sessions.middleware.SessionMiddleware',
  'django.middleware.common.CommonMiddleware',
  'django.middleware.csrf.CsrfViewMiddleware',
  'django.contrib.auth.middleware.AuthenticationMiddleware',
  'django.contrib.messages.middleware.MessageMiddleware',
  'django.middleware.clickjacking.XFrameOptionsMiddleware',
  'django.contrib.sites.middleware.CurrentSiteMiddleware',
  'django.middleware.http.ConditionalGetMiddleware',
  'django.middleware.gzip.GZipMiddleware']

 Traceback (most recent call last):
   File "/Users/me/p/lib/python3.12/site-
 packages/django/core/handlers/exception.py", line 55, in inner
     response = get_response(request)
                ^^^^^^^^^^^^^^^^^^^^^
   File "/Users/me/p/lib/python3.12/site-
 packages/django/core/handlers/base.py", line 197, in _get_response
     response = wrapped_callback(request, *callback_args,
 **callback_kwargs)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File
 
"/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/concurrent/futures/_base.py",
 line 449, in result
     return self.__get_result()
            ^^^^^^^^^^^^^^^^^^^
   File
 
"/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/concurrent/futures/_base.py",
 line 401, in __get_result
     raise self._exception
     ^^^^^^^^^^^^^^^^^^^^^
   File "/Users/me/p/lib/python3.12/site-
 packages/django/views/generic/base.py", line 104, in view
     return self.dispatch(request, *args, **kwargs)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "/Users/me/p/lib/python3.12/site-
 packages/django/utils/decorators.py", line 48, in _wrapper
     return bound_method(*args, **kwargs)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "/Users/me/p/lib/python3.12/site-
 packages/django/views/decorators/cache.py", line 81, in _view_wrapper
     add_never_cache_headers(response)
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "/Users/me/p/lib/python3.12/site-packages/django/utils/cache.py",
 line 292, in add_never_cache_headers
     patch_response_headers(response, cache_timeout=-1)
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   File "/Users/me/p/lib/python3.12/site-packages/django/utils/cache.py",
 line 283, in patch_response_headers
     if not response.has_header("Expires"):
            ^^^^^^^^^^^^^^^^^^^

 Exception Type: AttributeError at /api/asynccheck/
 Exception Value: 'coroutine' object has no attribute 'has_header'
 }}}

-- 
Ticket URL: <https://code.djangoproject.com/ticket/35133>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.

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