request issue with unicode?

unicode.py

#!/usr/bin/env python

from requests import get

def func(endpoint, dictionary):

    resp = get(endpoint, headers=dictionary)
    print(resp.status_code)

if __name__ == "__main__":
    my_unicode_dict = {u'foo': u'bar'}
    my_other_dict = {'foo': 'bar'}

    func("http://www.google.com", my_other_dict)
    func("http://www.google.com", my_unicode_dict)

ValueError

$ python test.py 
200
Traceback (most recent call last):
  File "test.py", line 15, in <module>
    func("http://www.google.com", my_unicode_dict)
  File "test.py", line 7, in func
    resp = get(endpoint, headers=dictionary)
  File "/Users/jesse.gonzalez/Envs/authmonitor/lib/python2.7/site-packages/requests/api.py", line 51, in get
    return request('get', url, **kwargs)
  File "/Users/jesse.gonzalez/Envs/authmonitor/lib/python2.7/site-packages/requests/api.py", line 39, in request
    return s.request(method=method, url=url, **kwargs)
  File "/Users/jesse.gonzalez/Envs/authmonitor/lib/python2.7/site-packages/requests/sessions.py", line 159, in request
    headers[k] = header_expand(v)
  File "/Users/jesse.gonzalez/Envs/authmonitor/lib/python2.7/site-packages/requests/utils.py", line 152, in header_expand
    for i, (value, params) in enumerate(headers):
ValueError: need more than 1 value to unpack