Ignore the HTTP_PROXY variable when REQUEST_METHOD environment is set, which
indicates that the script is in CGI mode.

Issue #27568 Reported and patch contributed by Rémi Rampin.

Ignore the HTTP_PROXY variable when REQUEST_METHOD environment is set, which
indicates that the script is in CGI mode.

Issue #27568 Reported and patch contributed by Rémi Rampin.

This backports the fix from #16611, per discussion with the release
manager.

These added a path attribute to pathlib.Path objects, and docs.
Instead, we're going to use PEP 519.

(Starting in the 3.4 branch and merging forward from there since that's what I did originally.)

On Windows a symlink can has the FILE_ATTRIBUTE_DIRECTORY flag.

Patch by Liang-Bo Wang.