'Supported token types and their respective methods
Additional tokens can be supported by extending this dictionary.
The Bearer token spec is stable and safe to use.
The MAC token spec is not yet stable and support for MAC tokens
is experimental and currently matching version 00 of the spec.'

@property
def token_types(self):

    return {u'Bearer': self._add_bearer_token, u'MAC': self._add_mac_token}
