Issue23806 - Document the no_proxy environment variable in Python 3 docs.
diff --git a/Doc/library/urllib.request.rst b/Doc/library/urllib.request.rst
index fc9b38f..5a47201 100644
--- a/Doc/library/urllib.request.rst
+++ b/Doc/library/urllib.request.rst
@@ -269,6 +269,11 @@
To disable autodetected proxy pass an empty dictionary.
+ The :envvar:`no_proxy` environment variable can be used to specify hosts
+ which shouldn't be reached via proxy; if set, it should be a comma-separated
+ list of hostname suffixes, optionally with ``:port`` appended, for example
+ ``cern.ch,ncsa.uiuc.edu,some.host:8080``.
+
.. class:: HTTPPasswordMgr()