def authenticate_redirect(self):
http = httpclient.AsyncHTTPClient()<EOL>http.fetch(self._oauth_request_token_url(), self.async_callback(<EOL>self._on_request_token, self._OAUTH_AUTHENTICATE_URL, None))<EOL>
Just like authorize_redirect(), but auto-redirects if authorized.

        This is generally the right interface to use if you are using
        Twitter for single-sign on.