id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
29353	_middleware_chain is not set for StaticFilesHandler	koxu1996	Claude Paroz	"I created ''functional_tests'' directory with empty ''__init__.py'' and ''test_all.py'' containing following code:

{{{
from django.test import LiveServerTestCase
from selenium import webdriver


class DemoTest(LiveServerTestCase):

    def test_can_get_empty_list_of_server_seeds(self):
        self.browser = webdriver.Firefox()
        
        print('Before page open')
        self.browser.get(self.live_server_url + '/')
        print('After page open')

        self.assertEqual(1, 1)

        self.browser.quit()
}}}
Running it with 'python manage.py test functional_tests/' result with success:

{{{
...
Before page open
After page open
.
----------------------------------------------------------------------
Ran 1 test in 7.048s

OK
...
}}}
But if I change LiveServerTestCase to StaticLiveServerTestCase then I am getting strange error:

{{{
$ python manage.py test functional_tests/
Creating test database for alias 'default'...
System check identified no issues (0 silenced).
Before page open
Traceback (most recent call last):
  File ""/usr/lib/python3.6/wsgiref/handlers.py"", line 137, in run
    self.result = application(self.environ, self.start_response)
  File ""/usr/lib/python3.6/site-packages/django/contrib/staticfiles/handlers.py"", line 67, in __call__                                                                                        
    return super().__call__(environ, start_response)
  File ""/usr/lib/python3.6/site-packages/django/core/handlers/wsgi.py"", line 146, in __call__
    response = self.get_response(request)
  File ""/usr/lib/python3.6/site-packages/django/contrib/staticfiles/handlers.py"", line 62, in get_response                                                                                    
    return super().get_response(request)
  File ""/usr/lib/python3.6/site-packages/django/core/handlers/base.py"", line 81, in get_response                                                                                              
    response = self._middleware_chain(request)
TypeError: 'NoneType' object is not callable
Traceback (most recent call last):
  File ""/usr/lib/python3.6/wsgiref/handlers.py"", line 137, in run
    self.result = application(self.environ, self.start_response)
  File ""/usr/lib/python3.6/site-packages/django/contrib/staticfiles/handlers.py"", line 67, in __call__                                                                                        
    return super().__call__(environ, start_response)
  File ""/usr/lib/python3.6/site-packages/django/core/handlers/wsgi.py"", line 146, in __call__
    response = self.get_response(request)
  File ""/usr/lib/python3.6/site-packages/django/contrib/staticfiles/handlers.py"", line 62, in get_response                                                                                    
    return super().get_response(request)
  File ""/usr/lib/python3.6/site-packages/django/core/handlers/base.py"", line 81, in get_response                                                                                              
    response = self._middleware_chain(request)
TypeError: 'NoneType' object is not callable
After page open
.
----------------------------------------------------------------------
Ran 1 test in 6.659s

OK
Destroying test database for alias 'default'...

}}}"	Bug	closed	contrib.staticfiles	2.0	Normal	fixed	staticfiles middleware_chain		Ready for checkin	1	0	0	0	0	0