>>> import urllib2
>>> req = urllib2.Request("http://www.google.com")
>>> req.add_header('User-Agent', 'bob')
>>> req.add_header('X-Poopy', 'Big Poopy')
>>> req.get_header('User-Agent')
>>> req.get_header('X-Poopy')
>>> req.headers
{'X-poopy': 'Big Poopy', 'User-agent': 'bob'}
>>> req.get_header('User-agent')
'bob'
>>> req.get_header('X-poopy')
'Big Poopy'