requests: 2.11.0: ValueError: Unable to determine SOCKS version

Hi,

I recently upgrade requests to 2.11.0 on centos 7 and keep getting this error when using it in a script:

File "/usr/local/lib/python2.7/dist-packages/github3/session.py", line 81, in request
    response = super(GitHubSession, self).request(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/requests/sessions.py", line 475, in request
    resp = self.send(prep, **send_kwargs)
  File "/usr/local/lib/python2.7/dist-packages/requests/sessions.py", line 596, in send
    r = adapter.send(request, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/requests/adapters.py", line 390, in send
    conn = self.get_connection(request.url, proxies)
  File "/usr/local/lib/python2.7/dist-packages/requests/adapters.py", line 290, in get_connection
    proxy_manager = self.proxy_manager_for(proxy)
  File "/usr/local/lib/python2.7/dist-packages/requests/adapters.py", line 184, in proxy_manager_for
    **proxy_kwargs
  File "/usr/local/lib/python2.7/dist-packages/requests/packages/urllib3/contrib/socks.py", line 154, in __init__
    "Unable to determine SOCKS version from %s" % proxy_url
ValueError: Unable to determine SOCKS version from socks://http://username:password@someproxy.com:8080/

I tried to change my system socks proxy setting to this format, but still getting the same error with the updated proxy setting…

username:password@someproxy.com:8080/

So I downgraded requests to 2.10.0 and everything starts to working again. I repeated the this process on ubuntu 16 and got the same result. Can someone look into this please?

Thanks, Ryan