def request_access_token(self, code, redirect_uri=None):
        '''
        Return access token as a JsonDict: {"access_token":"your-access-token","expires":12345678,"uid":1234}, expires is represented using standard unix-epoch-time
        '''
        redirect = redirect_uri or self._redirect_uri
        resp_text = _http('POST', 'https://graph.qq.com/oauth2.0/token',
                          client_id=self._client_id, client_secret=self._client_secret,
                          redirect_uri=redirect, code=code, grant_type='authorization_code')
        return self._parse_access_token(resp_text)
Return access token as a JsonDict: {"access_token":"your-access-token","expires":12345678,"uid":1234}, expires is represented using standard unix-epoch-time