authentication with urllib3

Assuming you're trying to do Basic Authentication, then you need to put the username and password encoded in an Authorization header. Here's one way to do that using the urllib3.make_headers helper:

import urllib3

http = urllib3.PoolManager()
url = '...'
headers = urllib3.make_headers(basic_auth='abc:xyz')
r = http.request('GET', url, headers=headers)