public function getFormatClass($format = '')
    {
        if ( ! empty($format)) {
            return $this->processContentType($format);
        }

        if (isset($_SERVER['CONTENT_TYPE'])) {
            $type = $this->processContentType($_SERVER['CONTENT_TYPE']);
            if ($type !== false) {
                return $type;
            }
        }

        if (isset($_SERVER['HTTP_CONTENT_TYPE'])) {
            $type = $this->processContentType($_SERVER['HTTP_CONTENT_TYPE']);
            if ($type !== false) {
                return $type;
            }
        }

        return 'Nathanmac\Utilities\Parser\Formats\JSON';
    }