protected function sendRequest($url,$param){
        $this->log("Making request to Amazon: ".$this->options['Action']);
        $response = $this->fetchURL($url,$param);
        
        while (isset($response['code']) && $response['code'] == '503' && $this->throttleStop==false){
            $this->sleep();
            $response = $this->fetchURL($url,$param);
        }
        
        $this->rawResponses[]=$response;
        return $response;
    }