Fixed #5897 -- Added the Content-Length response header in CommonMiddleware

Thanks Tim Graham for the review.

1 files changed, 4 insertions, 0 deletions

diff --git a/django/middleware/common.py b/django/middleware/common.py
index 8cb00ff250..b705f72b81 100644
--- a/django/middleware/common.py
+++ b/django/middleware/common.py
@@ -123,6 +123,10 @@ class CommonMiddleware(MiddlewareMixin):
                     etag=unquote_etag(response['ETag']),
                     response=response,
                 )
+        # Add the Content-Length header to non-streaming responses if not
+        # already set.
+        if not response.streaming and not response.has_header('Content-Length'):
+            response['Content-Length'] = str(len(response.content))
 
         return response