[1.2.X] Fixed #13283 -- Corrected CACHE_MIDDLEWARE_ANONYMOUS_ONLY's bad habit of setting Vary: Cookie on all responses and destroying cache efficiency. Thanks to natrius for the fix.

Backport of r15381 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.2.X@15382 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 10 insertions, 0 deletions

diff --git a/django/utils/cache.py b/django/utils/cache.py
index 6cfd893668..58d087b079 100644
--- a/django/utils/cache.py
+++ b/django/utils/cache.py
@@ -134,6 +134,16 @@ def patch_vary_headers(response, newheaders):
                           if newheader.lower() not in existing_headers]
     response['Vary'] = ', '.join(vary_headers + additional_headers)
 
+def has_vary_header(response, header_query):
+    """
+    Checks to see if the response has a given header name in its Vary header.
+    """
+    if not response.has_header('Vary'):
+        return False
+    vary_headers = cc_delim_re.split(response['Vary'])
+    existing_headers = set([header.lower() for header in vary_headers])
+    return header_query.lower() in existing_headers
+
 def _i18n_cache_key_suffix(request, cache_key):
     """If enabled, returns the cache key ending with a locale."""
     if settings.USE_I18N: