pip connection failure: cannot fetch index base URL http://pypi.python.org/simple/

I run `sudo pip install git-review`, and get the following messages: <!-- language: lang-none --> Downloading/unpacking git-review Cannot fetch index base URL http://pypi.python.org/simple/ Could not find any downloads that satisfy the requirement git-review No distributions at all found for git-review Storing complete log in /home/sai/.pip/pip.log Does anyone has any idea about this?