ConditionalGetMiddleware deprecated in Django 1.11
Django deprecated ConditionalGETMiddleware add `Content-Lenght` header
@@ -128,4 +128,4 @@ a full webserver.
.. note:: In particular, the Django backend does not set ``Content-Length`` by
default, while most others do. If running behind ELB, either use chunked
encoding as above, or force Django to specify ``Content-Length`` with the
- "Conditional GET" Django middleware.
+ ``CommonMiddleware`` (``ConditionalGetMiddleware`` in Django < 1.11)
