I have a server, onto which I want to use Python, that is behind a company firewall. I do not want to mess with it and the only thing I can do is to make a firewall exception for specific URL/domains.
I also want to access packages located on PYPI, using pip or easy_install. Therefore, do you know which URL should I ask to be listed in the exception rules for the firewall, except *.pypi.python.org?
I've solved it adding these domains to the firewall whitelist:

pypi.python.org
pypi.org
pythonhosted.org
what url should I authorize to use pip behind a firewall?