docs: 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