Ticket #15066: gzip-generators.diff

django/middleware/gzip.py

@@ -1 +1 @@
 import re
+from types import GeneratorType
 
 from django.utils.text import compress_string
 from django.utils.cache import patch_vary_headers
@@ -13 +14 @@
     """
     def process_response(self, request, response):
         # It's not worth compressing non-OK or really short responses.
-        if response.status_code != 200 or len(response.content) < 200:
+        # Responses that are streamed using a generator are not supported
+        # here because the content length cannot be determined beforehand.
+        if (response.status_code != 200 or
+            isinstance(response._container, GeneratorType) or
+            len(response.content) < 200):
             return response
 
         patch_vary_headers(response, ('Accept-Encoding',))