http_referer. what's wrong with that?

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Because I got this

echo $_SERVER['HTTP_REFERER'];

I end up with this

Notice: Undefined index: HTTP_REFERER in
D:\Hosting\5291100\html\blueprint\bp_library.php on line 16
die;

Now, this is of course after the <?php error_reporting (E_ALL); ?>  change.

One solution is to dodge it by

echo @$_SERVER['HTTP_REFERER'];

But I'm still curious, what configuration am I missing so that
http_referer is treated like that?

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