GuzzleHttp\Psr7\Uri::filterPort PHP Method

    private function filterPort($port)
    {
        if ($port === null) {
            return null;
        }
        $port = (int) $port;
        if (1 > $port || 0xffff < $port) {
            throw new \InvalidArgumentException(sprintf('Invalid port: %d. Must be between 1 and 65535', $port));
        }
        return $port;
    }