Issue9637 - Explain in getproxies_environment that <scheme>_proxy environ variable case does not matter.
diff --git a/Doc/library/urllib.request.rst b/Doc/library/urllib.request.rst
index 6b2b013..cc759a4 100644
--- a/Doc/library/urllib.request.rst
+++ b/Doc/library/urllib.request.rst
@@ -124,10 +124,10 @@
.. function:: getproxies()
This helper function returns a dictionary of scheme to proxy server URL
- mappings. It scans the environment for variables named ``<scheme>_proxy``
- for all operating systems first, and when it cannot find it, looks for proxy
- information from Mac OSX System Configuration for Mac OS X and Windows
- Systems Registry for Windows.
+ mappings. It scans the environment for variables named ``<scheme>_proxy``,
+ in a case insensitive approach, for all operating systems first, and when it
+ cannot find it, looks for proxy information from Mac OSX System
+ Configuration for Mac OS X and Windows Systems Registry for Windows.
The following classes are provided: