[issue42627] urllib.request.getproxies() misparses Windows registry proxy settings

[双草酸酯]

双草酸酯 <admin at 0x.mk> added the comment:

I came across this issue as well.
I checked Microsoft documentations and it seems `InternetGetProxyInfo` in WinInet is deprecated, while `WinHttpGetIEProxyConfigForCurrentUser` in WinHTTP will return the exact same string as what it stored registery. 

https://docs.microsoft.com/en-US/troubleshoot/windows-client/networking/configure-client-proxy-server-settings-by-registry-file
Also from this documentation, a proxy server could have "http://" prefix, so I guess it could also support "https://" prefix if a user set a https proxy.

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components:  -Windows
nosy: +kotori

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<https://bugs.python.org/issue42627>
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