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

[狂男风]

狂男风 <crazyboyfeng at qq.com> added the comment:

We know Windows reslove:
`http=host:port;https=host:port;ftp=host:port;socks=host:port`
as:
`http=http://host:port;https=http://host:port;ftp=http://host:port;socks=socks://host:port`
means:  
Using HTTP type proxy for HTTP, HTTPS and FTP requests, but Socks4/4a type proxy for the other TCP requests.
We notice that socks are different from the others.

Now I want to know what if Windows slove this:
`http=socks://host:port;ftp=https://host:port;socks=https://host:port`
Does it mean using Socks4/4a type proxy for HTTP requests, HTTPS type proxy for FTP requests, and HTTP type proxy for the other TCP requests? 
Or just invalid settings?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42627>
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