Http::followRedirect() 

\nn\t3::Http()->followRedirect($url); 

Determine redirect destination

\nn\t3::Http()->followRedirect( 'https://www.99grad.de/some/redirect' );
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@param string $url
@return void

Source Code 

public function followRedirect( string $url )
{
	$ch = curl_init();
	curl_setopt($ch, CURLOPT_URL, $url);
	curl_setopt($ch, CURLOPT_HEADER, true);
	curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
	curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
	curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
	$response = curl_exec($ch);
	$url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);
	curl_close($ch);
	return $url;
}
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