I have tried everything on this q&a to solve it but I still receive that error.
My latest attempt is based on Lukasa\'s comment and my code looks like this:
In all of the versions of Requests on PyPI there is no support for requesting HTTPS
sites over a proxy since there is no support for the CONNECT
verb. Our pre-release branch for 2.0 has this support and it works on every proxy I have tried. If you wish to check that out and try it with this, then you won't need the custom adapter either.
Otherwise, you will have to wait until we release 2.0