[issue23439] Fixed http.client.__all__ and added a test

[Roundup Robot]

Roundup Robot added the comment:

New changeset 21b31f5438ae by Berker Peksag in branch '3.4':
Issue #23439: Add missing entries to http.client.__all__.
https://hg.python.org/cpython/rev/21b31f5438ae

New changeset 95533c9edaaf by Berker Peksag in branch 'default':
Issue #23439: Add missing entries to http.client.__all__.
https://hg.python.org/cpython/rev/95533c9edaaf

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nosy: +python-dev

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