def post(self, api_method, http_method='POST', expected_status=(200,), **extra_params):

        if not (api_method.startswith('http://') or api_method.startswith('https://')):
            api_method = '%s%s%s' % (
                self.service_info['default_api_prefix'], api_method,
                self.service_info['default_api_suffix']
                )

        if self.token is None:
            self.token = OAuthAccessToken.get_by_key_name(self.get_cookie())

        logging.info(self.get_signed_body(
            api_method, self.token, http_method, **extra_params
            ))
            
        fetch = urlfetch(url=api_method, payload=self.get_signed_body(
            api_method, self.token, http_method, **extra_params
            ), method=http_method)

        if fetch.status_code not in expected_status:
            raise ValueError(
                "Error calling... Got return status: %i [%r]" %
                (fetch.status_code, fetch.content)
                )

        return decode_json(fetch.content)