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$_cusIp = $ENV{'HTTP_X_FORWARDED_FOR'} || $ENV{REMOTE_ADDR};

$_cusIp = $ENV{'HTTP_X_FORWARDED_FOR'} or $ENV{REMOTE_ADDR};

$_cusIp = $ENV{'HTTP_X_FORWARDED_FOR'};
$_cusIp = $ENV{REMOTE_ADDR} if !$_cusIp;