v12: PHP Warning: Undefined array key "HTTP_REFERER"

[ulrike-cosmoblonde]

Hi,

I am using:
TYPO3 v12
PHP 8.1 with warnings active
Branch feature/v12

If I reload a form that has a cleverreach finisher configured and has been already submitted, I get a PHP warning: Undefined array key "HTTP_REFERER" in file /cleverreach/Classes/CleverReach/Api.php for line 292 in the function sendSubscribeMail.

If that line is adjusted as follows, the warning disappears:

 $doidata = [
            'user_ip' => $_SERVER['REMOTE_ADDR'],
            'user_agent' => $_SERVER['HTTP_USER_AGENT'],
            'referer' => key_exists('HTTP_REFERER',$_SERVER) ? $_SERVER['HTTP_REFERER'] : '',
        ];

Could you adjust the code?

Thanks!
Ulrike