Basic Auth broken in future/backports/urllib/request.py ?

This code works in python 3 but not python 2.7

Based on Basic Auth Example in Python Manual

from future import standard_library
standard_library.install_aliases()

import urllib.request
# Create an OpenerDirector with support for Basic HTTP Authentication...
auth_handler = urllib.request.HTTPBasicAuthHandler()
auth_handler.add_password(realm='Fake Realm',
                          uri='https://httpbin.org',
                          user='a',
                          passwd='b')
opener = urllib.request.build_opener(auth_handler)
# ...and install it globally so it can be used with urlopen.
urllib.request.install_opener(opener)
urllib.request.urlopen('https://httpbin.org/basic-auth/a/b')

Python 2 gives this error

Traceback (most recent call last):
  File "t2.py", line 14, in <module>
    urllib.request.urlopen('https://httpbin.org/basic-auth/a/b')
  File "/Users/tingle/code/ezid/ve27/lib/python2.7/site-packages/future/backports/urllib/request.py", line 171, in urlopen
    return opener.open(url, data, timeout)
  File "/Users/tingle/code/ezid/ve27/lib/python2.7/site-packages/future/backports/urllib/request.py", line 500, in open
    response = meth(req, response)
  File "/Users/tingle/code/ezid/ve27/lib/python2.7/site-packages/future/backports/urllib/request.py", line 612, in http_response
    'http', request, response, code, msg, hdrs)
  File "/Users/tingle/code/ezid/ve27/lib/python2.7/site-packages/future/backports/urllib/request.py", line 538, in error
    return self._call_chain(*args)
  File "/Users/tingle/code/ezid/ve27/lib/python2.7/site-packages/future/backports/urllib/request.py", line 466, in _call_chain
    result = func(*args)
  File "/Users/tingle/code/ezid/ve27/lib/python2.7/site-packages/future/backports/urllib/request.py", line 620, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
future.backports.urllib.error.HTTPError: HTTP Error 401: UNAUTHORIZED