ApiClient::getId

private function getId(string $headers): ?int
{
	$id = null;
	foreach (explode("n", $headers) as $header)
	{
		if(mb_strpos($header, ':') !== false)
		{
			[$headerName, $headerValue] = explode(':', $header, 2);
			if(mb_strtolower($headerName) === 'content-id')
			{
				$part = explode(':', $headerValue);
				$id = (int) rtrim($part[1], ">");
				break;
			}
		}
	}

	return $id;
}