Library::getCurrentServerUrl

static function getCurrentServerUrl(): string
{
	static $url;
	if ($url === null)
	{
		$context = BitrixMainApplication::getInstance()->getContext();
		$scheme = $context->getRequest()->isHttps() ? 'https' : 'http';
		$server = $context->getServer();
		$domain = Option::get('main', 'server_name', '');
		if (empty($domain))
		{
			$domain = $server->getServerName();
		}
		if (preg_match('/^(?.+):(?d+)$/', $domain, $matches))
		{
			$domain = $matches['domain'];
			$port = (int)$matches['port'];
		}
		else
		{
			$port = (int)$server->getServerPort();
		}
		$port = in_array($port, [0, 80, 443]) ? '' : ':'.$port;

		$url = $scheme.'://'.$domain.$port;
	}

	return $url;
}