public function saveDebugFiles()
    {
        $tmpdir   = sys_get_temp_dir();
        $fname    = $this->evidence.'-'.$this->curlInfo['when'].'.'.$this->format;
        $reqname  = $tmpdir.'/request-'.$fname;
        $respname = $tmpdir.'/response-'.$fname;
        if (file_put_contents($reqname, $this->postFields)) {
            $this->addStatusMessage($reqname, 'debug');
        }
        if (file_put_contents($respname, $this->lastCurlResponse)) {
            $this->addStatusMessage($respname, 'debug');
        }
    }