my ($host, $port, $request, $proto) = ('tcp');
But that assigns 'tcp' to $host. Shouldn't it be assigned to $proto?
So, maybe one of these:
my ($host, $port, $request, $proto) = ( undef, undef, undef, 'tcp' );
# or
my ($host, $port, $request, $proto) = ( '', '', '', 'tcp' );
# or
my ($host, $port, $request, $proto);
$proto = 'tcp';
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