from libcloud.compute.types import Provider
from libcloud.compute.providers import get_driver

HTTP_PROXY_URL_NO_AUTH_1 = 'http://<proxy hostname 1>:<proxy port 2>'
HTTPS_PROXY_URL_NO_AUTH_1 = 'https://<proxy hostname 1>:<proxy port 2>'

cls = get_driver(Provider.RACKSPACE)

# 1. Use http proxy
driver = cls('username', 'api key', region='ord',
             proxy_url=HTTP_PROXY_URL_NO_AUTH_1)

# 2. Use https proxy
driver = cls('username', 'api key', region='ord',
             proxy_url=HTTPS_PROXY_URL_NO_AUTH_1)