Proxy settings for python pip in a corporate environment don't work (for example, Python 3.7.5 is OK, but 3.7.6 is NG)

About what

As the title says.

What kind of person is the article for?

Since it is from within the company, pip recognizes that there is a proxy setting, A person who unexpectedly encounters an error even though he has set a proxy.

Specifically, the following error.

ip._vendor.urllib3.exceptions.ProxySchemeUnknown: Not supported proxy scheme

raise ProxySchemeUnknown

The following is an error that was forcibly reproduced at home, so It may not be strict. .. ..

    conn = self.get_connection(request.url, proxies)
  File "C:\Users\XYZZZ\AppData\Local\Programs\Python\Python37\lib\site-packages\pip\_vendor\requests\adapters.py", line 309, in get_connection
    proxy_manager = self.proxy_manager_for(proxy)
  File "C:\Users\XYZZZ\AppData\Local\Programs\Python\Python37\lib\site-packages\pip\_vendor\requests\adapters.py", line 199, in proxy_manager_for
    **proxy_kwargs)
  File "C:\Users\XYZZZ\AppData\Local\Programs\Python\Python37\lib\site-packages\pip\_vendor\urllib3\poolmanager.py", line 470, in proxy_from_url
    return ProxyManager(proxy_url=url, **kw)
  File "C:\Users\XYZZZ\AppData\Local\Programs\Python\Python37\lib\site-packages\pip\_vendor\urllib3\poolmanager.py", line 420, in __init__
    raise ProxySchemeUnknown(proxy.scheme)
pip._vendor.urllib3.exceptions.ProxySchemeUnknown: Not supported proxy scheme httpyy

Conclusion

Due to the difference in minor versions of python, an error may occur due to the difference in proxy setting method. Specifically, I get an error in Python 3.7.6.

http:

It will be solved if you add. (You can also go back to Python 3.7.5.) ** I feel a little terrible. ** **

Information can be found on the following github. Python 3.7.6: urllib3.exceptions.ProxySchemeUnknown #5297