Fixed #27345 -- Stopped setting the Date header in ConditionalGetMiddleware.

django/middleware/http.py

@@ -2,7 +2,7 @@ from django.utils.cache import (
     cc_delim_re, get_conditional_response, set_response_etag,
 )
 from django.utils.deprecation import MiddlewareMixin
-from django.utils.http import http_date, parse_http_date_safe
+from django.utils.http import parse_http_date_safe
 
 
 class ConditionalGetMiddleware(MiddlewareMixin):
@@ -12,10 +12,9 @@ class ConditionalGetMiddleware(MiddlewareMixin):
     If-Modified-Since, the response is replaced by an HttpNotModified. An ETag
     header is added if needed.
 
-    Also sets the Date and Content-Length response-headers.
+    Also sets the Content-Length response-header.
     """
     def process_response(self, request, response):
-        response['Date'] = http_date()
         if not response.streaming and not response.has_header('Content-Length'):
             response['Content-Length'] = str(len(response.content))
 

docs/ref/middleware.txt

@@ -181,11 +181,12 @@ header, the middleware adds one if needed. If the response has a ``ETag`` or
 ``If-Modified-Since``, the response is replaced by an
 :class:`~django.http.HttpResponseNotModified`.
 
-Also sets the ``Date`` and ``Content-Length`` response-headers.
+Also sets ``Content-Length`` response-header.
 
 .. versionchanged:: 1.11
 
-    In older versions, the middleware didn't set the ``ETag`` header.
+    In older versions, the middleware set the ``Date`` header and didn't set
+    the ``ETag`` header.
 
 Locale middleware
 -----------------

docs/releases/1.11.txt

@@ -559,6 +559,9 @@ Miscellaneous
 * In the admin templates, ``<p class="help">`` is replaced with a ``<div>`` tag
   to allow including lists inside help text.
 
+* ``ConditionalGetMiddleware`` no longer sets the ``Date`` header as Web
+  servers set that header.
+
 .. _deprecated-features-1.11:
 
 Features deprecated in 1.11

tests/middleware/tests.py

@@ -478,13 +478,6 @@ class ConditionalGetMiddlewareTest(SimpleTestCase):
         self.req = RequestFactory().get('/')
         self.resp = self.client.get(self.req.path_info)
 
-    # Tests for the Date header
-
-    def test_date_header_added(self):
-        self.assertNotIn('Date', self.resp)
-        self.resp = ConditionalGetMiddleware().process_response(self.req, self.resp)
-        self.assertIn('Date', self.resp)
-
     # Tests for the Content-Length header
 
     def test_content_length_header_added(self):