[1.7.x] Added a test to verify headers set by default middleware; refs #23939.

import sys

import unittest

from django.test import TestCase

@unittest.skipIf(sys.version_info < (3, 3),

    'Python < 3.3 cannot import the project template because '

    'django/conf/project_template doesn\'t have an __init__.py file.')

class TestStartProjectSettings(TestCase):

    def test_middleware_classes_headers(self):

        """

        Ensure headers sent by the default MIDDLEWARE_CLASSES do not

        inadvertently change. For example, we never want "Vary: Cookie" to

        appear in the list since it prevents the caching of responses.

        """

        from django.conf.project_template.project_name.settings import MIDDLEWARE_CLASSES

        with self.settings(

            MIDDLEWARE_CLASSES=MIDDLEWARE_CLASSES,

            ROOT_URLCONF='project_template.urls',

        ):

            response = self.client.get('/empty/')

            headers = sorted(response.serialize_headers().split(b'\r\n'))

            self.assertEqual(headers, [

                b'Content-Type: text/html; charset=utf-8',

                b'X-Frame-Options: SAMEORIGIN',

            ])

from django.conf.urls import url

from . import views

urlpatterns = [

    url(r'^empty/$', views.empty_view),

]

from django.http import HttpResponse

def empty_view(request, *args, **kwargs):

    return HttpResponse('')