my $port = $ENV{SERVER_PORT};
$port = undef if (($scheme eq 'http' ) && ($port == 80))
|| (($scheme eq 'https') && ($port == 443));
my $port = $ENV{SERVER_PORT};
$port = undef if (($scheme eq 'http' ) && ($port == 80))
|| (($scheme eq 'https') && ($port == 443));