Hey Diptesh - did you get anywhere with understanding this? Did y ou get
any response from the Django devs?
Just happened to me on my Staging site. Recently upgraded from 3.0 to 3.1
I can login with Firefox, but Chrome crashes with the following error:
```python
Internal Server Error: /home/
Traceback (most recent call last):
File
"/usr/local/lib/python3.8/site-packages/django/contrib/sessions/backends/base.py",
line 215, in _get_session
return self._session_cache
AttributeError: 'SessionStore' object has no attribute '_session_cache'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File
"/usr/local/lib/python3.8/site-packages/django/contrib/sessions/backends/base.py",
line 118, in decode
return signing.loads(session_data, salt=self.key_salt,
serializer=self.serializer)
File "/usr/local/lib/python3.8/site-packages/django/core/signing.py", line
135, in loads
base64d = TimestampSigner(key, salt=salt).unsign(s,
max_age=max_age).encode()
File "/usr/local/lib/python3.8/site-packages/django/core/signing.py", line
201, in unsign
result = super().unsign(value)
File "/usr/local/lib/python3.8/site-packages/django/core/signing.py", line
184, in unsign
raise BadSignature('Signature "%s" does not match' % sig)
django.core.signing.BadSignature: Signature
"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" does not match
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File
"/usr/local/lib/python3.8/site-packages/django/core/handlers/exception.py",
line 47, in inner
response = get_response(request)
File "/usr/local/lib/python3.8/site-packages/django/core/handlers/base.py",
line 179, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python3.8/site-packages/django/views/generic/base.py",
line 73, in view
return self.dispatch(request, *args, **kwargs)
File
"/usr/local/lib/python3.8/site-packages/django/contrib/auth/mixins.py",
line 50, in dispatch
if not request.user.is_authenticated:
File "/usr/local/lib/python3.8/site-packages/django/utils/functional.py",
line 240, in inner
self._setup()
File "/usr/local/lib/python3.8/site-packages/django/utils/functional.py",
line 376, in _setup
self._wrapped = self._setupfunc()
File "/usr/local/lib/python3.8/site-packages/django_otp/middleware.py",
line 38, in _verify_user
user.otp_device = None
File "/usr/local/lib/python3.8/site-packages/django/utils/functional.py",
line 270, in __setattr__
self._setup()
File "/usr/local/lib/python3.8/site-packages/django/utils/functional.py",
line 376, in _setup
self._wrapped = self._setupfunc()
File
"/usr/local/lib/python3.8/site-packages/django/contrib/auth/middleware.py",
line 23, in <lambda>
request.user = SimpleLazyObject(lambda: get_user(request))
File
"/usr/local/lib/python3.8/site-packages/django/contrib/auth/middleware.py",
line 11, in get_user
request._cached_user = auth.get_user(request)
File
"/usr/local/lib/python3.8/site-packages/django/contrib/auth/__init__.py",
line 174, in get_user
user_id = _get_user_session_key(request)
File
"/usr/local/lib/python3.8/site-packages/django/contrib/auth/__init__.py",
line 58, in _get_user_session_key
return get_user_model()._meta.pk.to_python(request.session[SESSION_KEY])
File
"/usr/local/lib/python3.8/site-packages/django/contrib/sessions/backends/base.py",
line 65, in __getitem__
return self._session[key]
File
"/usr/local/lib/python3.8/site-packages/django/contrib/sessions/backends/base.py",
line 220, in _get_session
self._session_cache = self.load()
File
"/usr/local/lib/python3.8/site-packages/django/contrib/sessions/backends/db.py",
line 44, in load
return self.decode(s.session_data) if s else {}
File
"/usr/local/lib/python3.8/site-packages/django/contrib/sessions/backends/base.py",
line 122, in decode
return self._legacy_decode(session_data)
File
"/usr/local/lib/python3.8/site-packages/django/contrib/sessions/backends/base.py",
line 126, in _legacy_decode
encoded_data = base64.b64decode(session_data.encode('ascii'))
File "/usr/local/lib/python3.8/base64.py", line 87, in b64decode
return binascii.a2b_base64(s)
binascii.Error: Incorrect padding
```
On Monday, 10 August 2020 at 12:21:34 UTC+1 Diptesh Choudhuri wrote:
>
>
> Environment:
>
>
>
>
> Request Method: GET
> Request URL: http://127.0.0.1:8000/admin/
>
>
> Django Version: 3.1
> Python Version: 3.8.3
> Installed Applications:
> ['django.contrib.admin',
> 'django.contrib.auth',
> 'django.contrib.contenttypes',
> 'django.contrib.sessions',
> 'django.contrib.messages',
> 'django.contrib.staticfiles',
> 'rest_framework',
> 'rest_framework.authtoken',
> 'accounts.apps.AccountsConfig',
> 'posts.apps.PostsConfig']
> 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']
>
>
>
>
>
>
> Traceback (most recent call last):
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/contrib/sessions/backends/base.py"
> , line 215, in _get_session
> return self._session_cache
>
>
> During handling of the above exception ('SessionStore' object has no
> attribute '_session_cache'), another exception occurred:
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/contrib/sessions/backends/base.py"
> , line 118, in decode
> return signing.loads(session_data, salt=self.key_salt, serializer=self
> .serializer)
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/core/signing.py"
> , line 135, in loads
> base64d = TimestampSigner(key, salt=salt).unsign(s, max_age=max_age).
> encode()
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/core/signing.py"
> , line 201, in unsign
> result = super().unsign(value)
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/core/signing.py"
> , line 184, in unsign
> raise BadSignature('Signature "%s" does not match' % sig)
>
>
> During handling of the above exception (Signature
> "JKiu07_FryzGGxaZmuA9hc0WmtZKBMOOeOj3Fp3j8ho" does not match), another
> exception occurred:
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/core/handlers/exception.py"
> , line 47, in inner
> response = get_response(request)
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/core/handlers/base.py"
> , line 179, in _get_response
> response = wrapped_callback(request, *callback_args, **callback_kwargs
> )
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/contrib/admin/sites.py"
> , line 251, in wrapper
> return self.admin_view(view, cacheable)(*args, **kwargs)
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/utils/decorators.py"
> , line 130, in _wrapped_view
> response = view_func(request, *args, **kwargs)
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/views/decorators/cache.py"
> , line 44, in _wrapped_view_func
> response = view_func(request, *args, **kwargs)
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/contrib/admin/sites.py"
> , line 222, in inner
> if not self.has_permission(request):
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/contrib/admin/sites.py"
> , line 196, in has_permission
> return request.user.is_active and request.user.is_staff
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/utils/functional.py"
> , line 240, in inner
> self._setup()
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/utils/functional.py"
> , line 376, in _setup
> self._wrapped = self._setupfunc()
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/contrib/auth/middleware.py"
> , line 23, in <lambda>
> request.user = SimpleLazyObject(lambda: get_user(request))
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/contrib/auth/middleware.py"
> , line 11, in get_user
> request._cached_user = auth.get_user(request)
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/contrib/auth/__init__.py"
> , line 174, in get_user
> user_id = _get_user_session_key(request)
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/contrib/auth/__init__.py"
> , line 58, in _get_user_session_key
> return get_user_model()._meta.pk.to_python(request.session[SESSION_KEY
> ])
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/contrib/sessions/backends/base.py"
> , line 65, in __getitem__
> return self._session[key]
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/contrib/sessions/backends/base.py"
> , line 220, in _get_session
> self._session_cache = self.load()
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/contrib/sessions/backends/db.py"
> , line 44, in load
> return self.decode(s.session_data) if s else {}
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/contrib/sessions/backends/base.py"
> , line 122, in decode
> return self._legacy_decode(session_data)
> File
> "/home/ignisda/.cache/pypoetry/virtualenvs/backend-3DENPaHW-py3.8/lib/python3.8/site-packages/django/contrib/sessions/backends/base.py"
> , line 126, in _legacy_decode
> encoded_data = base64.b64decode(session_data.encode('ascii'))
> File "/usr/lib/python3.8/base64.py", line 87, in b64decode
> return binascii.a2b_base64(s)
>
>
> Exception Type: Error at /admin/
> Exception Value: Incorrect padding
>
>
> This happened first when I was developing on my Android device using
> Termux app. I switched my browser to Google-Chrome and the issue was
> resolved.
> Then today I was developing on my PC, using qutebrowser and this error
> popped up again. Switching to Google-Chrome fixed the issue.
>
> I don't think this is an issue with the browsers themselves, because I
> have completed entire django projects in both these devices, and never had
> to switch to Chrome.
>
> The only differences happen to be- This is my first time using
> djangorestframework, first time using django 3.1
>
> Is this a bug that has leaked into django 3.1 inadvertently?
>
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