code: private function doPost($oauth1AccessToken, $path)
      {
          // Construct the OAuth 1 header.
          $signature = rawurlencode($this->appInfo->getSecret()) . "&" . rawurlencode($oauth1AccessToken->getSecret());
          $authHeaderValue = "OAuth oauth_signature_method=\"PLAINTEXT\""
               . ", oauth_consumer_key=\"" . rawurlencode($this->appInfo->getKey()) . "\""
               . ", oauth_token=\"" . rawurlencode($oauth1AccessToken->getKey()) . "\""
               . ", oauth_signature=\"" . $signature . "\"";
  
          return RequestUtil::doPostWithSpecificAuth(
              $this->clientIdentifier, $authHeaderValue, $this->userLocale,
              $this->appInfo->getHost()->getApi(),
              $path,
              null);
      }
docs: @param OAuth1AccessToken $oauth1AccessToken
  @param string $path
  
  @return HttpResponse
  
  @throws Exception