Amp\Artax\Client::normalizeRequestProtocol PHP 메소드

    private function normalizeRequestProtocol(Request $request)
    {
        if (!($protocol = $request->getProtocol())) {
            $request->setProtocol('1.1');
        } elseif (!($protocol == '1.0' || $protocol == '1.1')) {
            throw new \InvalidArgumentException('Invalid request protocol: ' . $protocol);
        }
    }