[1.5.x] Prevented caching of streaming responses.

The test introduced in 4b278131 accidentally passed because of a
limitation of Python < 3.3.

Refs #17758, #7581.

Backport of 1c8be95 from master.

1 files changed, 1 insertions, 1 deletions

diff --git a/django/middleware/cache.py b/django/middleware/cache.py
index 34bf0ca4a4..94c18eac1e 100644
--- a/django/middleware/cache.py
+++ b/django/middleware/cache.py
@@ -93,7 +93,7 @@ class UpdateCacheMiddleware(object):
         if not self._should_update_cache(request, response):
             # We don't need to update the cache, just return.
             return response
-        if not response.status_code == 200:
+        if response.streaming or response.status_code != 200:
             return response
         # Try to get the timeout from the "max-age" section of the "Cache-
         # Control" header before reverting to using the default cache_timeout