Fixed #7581 -- Added streaming responses.

Thanks mrmachine and everyone else involved on this long-standing ticket.

tests/regressiontests/cache/tests.py

@@ -19,7 +19,8 @@ from django.core.cache import get_cache
 from django.core.cache.backends.base import (CacheKeyWarning,
     InvalidCacheBackendError)
 from django.db import router
-from django.http import HttpResponse, HttpRequest, QueryDict
+from django.http import (HttpResponse, HttpRequest, StreamingHttpResponse,
+    QueryDict)
 from django.middleware.cache import (FetchFromCacheMiddleware,
     UpdateCacheMiddleware, CacheMiddleware)
 from django.template import Template
@@ -1416,6 +1417,29 @@ class CacheI18nTest(TestCase):
         # reset the language
         translation.deactivate()
 
+    @override_settings(
+            CACHE_MIDDLEWARE_KEY_PREFIX="test",
+            CACHE_MIDDLEWARE_SECONDS=60,
+            USE_ETAGS=True,
+    )
+    def test_middleware_with_streaming_response(self):
+        # cache with non empty request.GET
+        request = self._get_request_cache(query_string='foo=baz&other=true')
+
+        # first access, cache must return None
+        get_cache_data = FetchFromCacheMiddleware().process_request(request)
+        self.assertEqual(get_cache_data, None)
+
+        # pass streaming response through UpdateCacheMiddleware.
+        content = 'Check for cache with QUERY_STRING and streaming content'
+        response = StreamingHttpResponse(content)
+        UpdateCacheMiddleware().process_response(request, response)
+
+        # second access, cache must still return None, because we can't cache
+        # streaming response.
+        get_cache_data = FetchFromCacheMiddleware().process_request(request)
+        self.assertEqual(get_cache_data, None)
+
 
 @override_settings(
         CACHES={