def prepare_bearer_headers(token, headers=None):
    """Add a `Bearer Token`_ to the request URI.
    Recommended method of passing bearer tokens.

    Authorization: Bearer h480djs93hd8

    .. _`Bearer Token`: http://tools.ietf.org/html/draft-ietf-oauth-v2-bearer-18
    """
    headers = headers or {}
    headers[u'Authorization'] = u'Bearer %s' % token
    return headers
