title: what url should I authorize to use pip behind a firewall?
body: <p>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.</p>
  
  <p>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?</p>