Happyr\LinkedIn\Http\UrlGenerator::getHttpProtocol PHP Method

    protected function getHttpProtocol()
    {
        if ($this->trustForwarded && isset($_SERVER['HTTP_X_FORWARDED_PROTO'])) {
            if ($_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https') {
                return 'https';
            }
            return 'http';
        }
        /*apache + variants specific way of checking for https*/
        if (isset($_SERVER['HTTPS']) && ($_SERVER['HTTPS'] === 'on' || $_SERVER['HTTPS'] == 1)) {
            return 'https';
        }
        /*nginx way of checking for https*/
        if (isset($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] === '443') {
            return 'https';
        }
        return 'http';
    }