Ticket #12789: fix_middleware_http.diff

django/middleware/http.py

@@ -16 +16 @@
 
         if response.has_header('ETag'):
             if_none_match = request.META.get('HTTP_IF_NONE_MATCH', None)
-            if if_none_match == response['ETag']:
+            content_length = request.META.get('CONTENT_LENGTH', 0)
+            if if_none_match == response['ETag'] and content_length != 0:
                 # Setting the status is enough here. The response handling path
                 # automatically removes content for this status code (in
                 # http.conditional_content_removal()).
@@ -48 +49 @@
         warnings.warn("SetRemoteAddrFromForwardedFor has been removed. "
                       "See the Django 1.1 release notes for details.",
                       category=DeprecationWarning)
-        raise MiddlewareNotUsed()
- No newline at end of file
+        raise MiddlewareNotUsed()