[issue26804] Prioritize lowercase proxy variables in urllib.request

[SilentGhost]

Changes by SilentGhost <ghost.adh at runbox.com>:


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components: +Library (Lib) -Extension Modules
nosy: +orsenthil
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26804>
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