[issue36029] Use consistent case for HTTP header fields

[Géry]

New submission from Géry <gery.ogam at gmail.com>:

Use consistent case for HTTP header fields, according to [RFC 7231](https://tools.ietf.org/html/rfc7231).

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components: Library (Lib)
messages: 335870
nosy: brett.cannon, eric.araujo, ezio.melotti, maggyero, mdk, ncoghlan, willingc
priority: normal
severity: normal
status: open
title: Use consistent case for HTTP header fields
type: enhancement
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36029>
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