def post(self, url, postParameters=None, urlParameters=None):
        """
        Implement libgreader's interface for authenticated POST request
        """
        if self._action_token == None:
            self._action_token = self.get(ReaderUrl.ACTION_TOKEN_URL)

        if self._http == None:
            self._setupHttp()
        uri = url + "?" + self.getParameters(urlParameters)
        postParameters.update({'T':self._action_token})
        body = self.postParameters(postParameters)
        response, content = self._http.request(uri, "POST", body=body)
        return content
Implement libgreader's interface for authenticated POST request