hii everyone,

i just saw the tutorial "Better way to get visitors IP"
and after i finished the tutorial i did it by myself and i got this message:

Notice: Undefined index: HTTP_CLIENT_IP in C:\Users\User\PhpstormProjects\Learn\conf.inc.php on line 3

Notice: Undefined index: HTTP_X_FORWARDED_FOR in C:\Users\User\PhpstormProjects\Learn\conf.inc.php on line 4

it is excactly as in the tutorial.
i need your help to understand why its doing this?