Refs #27829 -- Removed settings.DEFAULT_CONTENT_TYPE per deprecation timeline.

django/conf/__init__.py

@@ -16,14 +16,11 @@ from pathlib import Path
 import django
 from django.conf import global_settings
 from django.core.exceptions import ImproperlyConfigured
-from django.utils.deprecation import (
-    RemovedInDjango30Warning, RemovedInDjango31Warning,
-)
+from django.utils.deprecation import RemovedInDjango31Warning
 from django.utils.functional import LazyObject, empty
 
 ENVIRONMENT_VARIABLE = "DJANGO_SETTINGS_MODULE"
 
-DEFAULT_CONTENT_TYPE_DEPRECATED_MSG = 'The DEFAULT_CONTENT_TYPE setting is deprecated.'
 FILE_CHARSET_DEPRECATED_MSG = (
     'The FILE_CHARSET setting is deprecated. Starting with Django 3.1, all '
     'files read from disk must be UTF-8 encoded.'
@@ -115,20 +112,6 @@ class LazySettings(LazyObject):
         """Return True if the settings have already been configured."""
         return self._wrapped is not empty
 
-    @property
-    def DEFAULT_CONTENT_TYPE(self):
-        stack = traceback.extract_stack()
-        # Show a warning if the setting is used outside of Django.
-        # Stack index: -1 this line, -2 the caller.
-        filename, _line_number, _function_name, _text = stack[-2]
-        if not filename.startswith(os.path.dirname(django.__file__)):
-            warnings.warn(
-                DEFAULT_CONTENT_TYPE_DEPRECATED_MSG,
-                RemovedInDjango30Warning,
-                stacklevel=2,
-            )
-        return self.__getattr__('DEFAULT_CONTENT_TYPE')
-
     @property
     def FILE_CHARSET(self):
         stack = traceback.extract_stack()
@@ -175,8 +158,6 @@ class Settings:
         if not self.SECRET_KEY:
             raise ImproperlyConfigured("The SECRET_KEY setting must not be empty.")
 
-        if self.is_overridden('DEFAULT_CONTENT_TYPE'):
-            warnings.warn(DEFAULT_CONTENT_TYPE_DEPRECATED_MSG, RemovedInDjango30Warning)
         if self.is_overridden('FILE_CHARSET'):
             warnings.warn(FILE_CHARSET_DEPRECATED_MSG, RemovedInDjango31Warning)
 
@@ -223,9 +204,7 @@ class UserSettingsHolder:
 
     def __setattr__(self, name, value):
         self._deleted.discard(name)
-        if name == 'DEFAULT_CONTENT_TYPE':
-            warnings.warn(DEFAULT_CONTENT_TYPE_DEPRECATED_MSG, RemovedInDjango30Warning)
-        elif name == 'FILE_CHARSET':
+        if name == 'FILE_CHARSET':
             warnings.warn(FILE_CHARSET_DEPRECATED_MSG, RemovedInDjango31Warning)
         super().__setattr__(name, value)
 

django/conf/global_settings.py

@@ -164,10 +164,8 @@ USE_L10N = False
 # notifications and other various emails.
 MANAGERS = ADMINS
 
-# Default content type and charset to use for all HttpResponse objects, if a
-# MIME type isn't manually specified. These are used to construct the
-# Content-Type header.
-DEFAULT_CONTENT_TYPE = 'text/html'
+# Default charset to use for all HttpResponse objects, if a MIME type isn't
+# manually specified. It's used to construct the Content-Type header.
 DEFAULT_CHARSET = 'utf-8'
 
 # Encoding of files read from disk (template and initial SQL files).

django/http/response.py

@@ -57,8 +57,7 @@ class HttpResponseBase:
         self._reason_phrase = reason
         self._charset = charset
         if content_type is None:
-            content_type = '%s; charset=%s' % (settings.DEFAULT_CONTENT_TYPE,
-                                               self.charset)
+            content_type = 'text/html; charset=%s' % self.charset
         self['Content-Type'] = content_type
 
     @property
@@ -427,7 +426,7 @@ class FileResponse(StreamingHttpResponse):
         elif hasattr(filelike, 'getbuffer'):
             self['Content-Length'] = filelike.getbuffer().nbytes
 
-        if self.get('Content-Type', '').startswith(settings.DEFAULT_CONTENT_TYPE):
+        if self.get('Content-Type', '').startswith('text/html'):
             if filename:
                 content_type, encoding = mimetypes.guess_type(filename)
                 # Encoding isn't set to prevent browsers from automatically

django/views/defaults.py

@@ -47,7 +47,7 @@ def page_not_found(request, exception, template_name=ERROR_404_TEMPLATE_NAME):
     try:
         template = loader.get_template(template_name)
         body = template.render(context, request)
-        content_type = None             # Django will use DEFAULT_CONTENT_TYPE
+        content_type = None             # Django will use 'text/html'.
     except TemplateDoesNotExist:
         if template_name != ERROR_404_TEMPLATE_NAME:
             # Reraise if it's a missing custom template.

docs/ref/class-based-views/mixins-simple.txt

@@ -83,7 +83,7 @@ Simple mixins
 
         The content type to use for the response. ``content_type`` is passed
         as a keyword argument to ``response_class``. Default is ``None`` --
-        meaning that Django uses :setting:`DEFAULT_CONTENT_TYPE`.
+        meaning that Django uses ``'text/html'``.
 
     **Methods**
 

docs/ref/request-response.txt

@@ -748,7 +748,7 @@ Methods
 
     ``content_type`` is the MIME type optionally completed by a character set
     encoding and is used to fill the HTTP ``Content-Type`` header. If not
-    specified, it is formed by the :setting:`DEFAULT_CONTENT_TYPE` and
+    specified, it is formed by ``'text/html'`` and the
     :setting:`DEFAULT_CHARSET` settings, by default: "`text/html; charset=utf-8`".
 
     ``status`` is the :rfc:`HTTP status code <7231#section-6>` for the response.

docs/ref/settings.txt

@@ -1195,24 +1195,7 @@ See also :setting:`NUMBER_GROUPING`, :setting:`THOUSAND_SEPARATOR` and
 Default: ``'utf-8'``
 
 Default charset to use for all ``HttpResponse`` objects, if a MIME type isn't
-manually specified. Used with :setting:`DEFAULT_CONTENT_TYPE` to construct the
-``Content-Type`` header.
-
-.. setting:: DEFAULT_CONTENT_TYPE
-
-``DEFAULT_CONTENT_TYPE``
-------------------------
-
-Default: ``'text/html'``
-
-Default content type to use for all ``HttpResponse`` objects, if a MIME type
-isn't manually specified. Used with :setting:`DEFAULT_CHARSET` to construct
-the ``Content-Type`` header.
-
-.. deprecated:: 2.0
-
-    This setting is deprecated because it doesn't interact well with
-    third-party apps and is obsolete since HTML5 has mostly superseded XHTML.
+manually specified. Used when constructing the ``Content-Type`` header.
 
 .. setting:: DEFAULT_EXCEPTION_REPORTER_FILTER
 
@@ -3436,7 +3419,6 @@ HTTP
 * :setting:`DATA_UPLOAD_MAX_MEMORY_SIZE`
 * :setting:`DATA_UPLOAD_MAX_NUMBER_FIELDS`
 * :setting:`DEFAULT_CHARSET`
-* :setting:`DEFAULT_CONTENT_TYPE`
 * :setting:`DISALLOWED_USER_AGENTS`
 * :setting:`FORCE_SCRIPT_NAME`
 * :setting:`INTERNAL_IPS`

docs/ref/template-response.txt

@@ -76,7 +76,7 @@ Methods
         The value included in the HTTP ``Content-Type`` header, including the
         MIME type specification and the character set encoding. If
         ``content_type`` is specified, then its value is used. Otherwise,
-        :setting:`DEFAULT_CONTENT_TYPE` is used.
+        ``'text/html'`` is used.
 
     ``status``
         The HTTP status code for the response.
@@ -171,7 +171,7 @@ Methods
         The value included in the HTTP ``Content-Type`` header, including the
         MIME type specification and the character set encoding. If
         ``content_type`` is specified, then its value is used. Otherwise,
-        :setting:`DEFAULT_CONTENT_TYPE` is used.
+        ``'text/html'`` is used.
 
     ``status``
         The HTTP status code for the response.

docs/releases/3.0.txt

@@ -240,6 +240,8 @@ to remove usage of these features.
 
 * ``django.shortcuts.render_to_response()`` is removed.
 
+* The ``DEFAULT_CONTENT_TYPE`` setting is removed.
+
 See :ref:`deprecated-features-2.1` for details on these changes, including how
 to remove usage of these features.
 

docs/topics/http/shortcuts.txt

@@ -46,8 +46,8 @@ Optional arguments
     view will call it just before rendering the template.
 
 ``content_type``
-    The MIME type to use for the resulting document. Defaults to the value of
-    the :setting:`DEFAULT_CONTENT_TYPE` setting.
+    The MIME type to use for the resulting document. Defaults to
+    ``'text/html'``.
 
 ``status``
     The status code for the response. Defaults to ``200``.

tests/view_tests/tests/test_default_content_type.py

@@ -1,58 +0,0 @@
-import sys
-from types import ModuleType
-
-from django.conf import DEFAULT_CONTENT_TYPE_DEPRECATED_MSG, Settings, settings
-from django.test import SimpleTestCase, ignore_warnings
-from django.utils.deprecation import RemovedInDjango30Warning
-
-
-class DefaultContentTypeTests(SimpleTestCase):
-    msg = DEFAULT_CONTENT_TYPE_DEPRECATED_MSG
-
-    @ignore_warnings(category=RemovedInDjango30Warning)
-    def test_default_content_type_is_text_html(self):
-        """
-        Content-Type of the default error responses is text/html. Refs #20822.
-        """
-        with self.settings(DEFAULT_CONTENT_TYPE='text/xml'):
-            response = self.client.get('/raises400/')
-            self.assertEqual(response['Content-Type'], 'text/html')
-
-            response = self.client.get('/raises403/')
-            self.assertEqual(response['Content-Type'], 'text/html')
-
-            response = self.client.get('/nonexistent_url/')
-            self.assertEqual(response['Content-Type'], 'text/html')
-
-            response = self.client.get('/server_error/')
-            self.assertEqual(response['Content-Type'], 'text/html')
-
-    def test_override_settings_warning(self):
-        with self.assertRaisesMessage(RemovedInDjango30Warning, self.msg):
-            with self.settings(DEFAULT_CONTENT_TYPE='text/xml'):
-                pass
-
-    def test_settings_init_warning(self):
-        settings_module = ModuleType('fake_settings_module')
-        settings_module.DEFAULT_CONTENT_TYPE = 'text/xml'
-        settings_module.SECRET_KEY = 'abc'
-        sys.modules['fake_settings_module'] = settings_module
-        try:
-            with self.assertRaisesMessage(RemovedInDjango30Warning, self.msg):
-                Settings('fake_settings_module')
-        finally:
-            del sys.modules['fake_settings_module']
-
-    def test_access_warning(self):
-        with self.assertRaisesMessage(RemovedInDjango30Warning, self.msg):
-            settings.DEFAULT_CONTENT_TYPE
-        # Works a second time.
-        with self.assertRaisesMessage(RemovedInDjango30Warning, self.msg):
-            settings.DEFAULT_CONTENT_TYPE
-
-    @ignore_warnings(category=RemovedInDjango30Warning)
-    def test_access(self):
-        with self.settings(DEFAULT_CONTENT_TYPE='text/xml'):
-            self.assertEqual(settings.DEFAULT_CONTENT_TYPE, 'text/xml')
-            # Works a second time.
-            self.assertEqual(settings.DEFAULT_CONTENT_TYPE, 'text/xml')