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-rw-r--r--docs/ref/middleware.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/docs/ref/middleware.txt b/docs/ref/middleware.txt
index cfa6a77665..35407493f7 100644
--- a/docs/ref/middleware.txt
+++ b/docs/ref/middleware.txt
@@ -471,6 +471,10 @@ Here are some hints about the ordering of various Django middleware classes:
#. :class:`~django.middleware.common.CommonMiddleware`
+ Before any middleware that may change the response (it sets the
+ ``Content-Length`` header). A middleware that appears before
+ ``CommonMiddleware`` and changes the response must reset ``Content-Length``.
+
Close to the top: it redirects when :setting:`APPEND_SLASH` or
:setting:`PREPEND_WWW` are set to ``True``.