I've only spent a few minutes looking through your code but you do not appear to be actually returning any value from the byName subroutine in your server Delivery package. If you return a value from this subroutine, it will be serialised and dispatched back in the response. For example:

sub byName {
  #Get the headers passed from the client
  my ($self, $in) = @_;
  my @input = %{$in};

  return "Hello World!";
}
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This code (untested of course) should return the string Hello World! in the SOAP server response. Additional complexity with respect to the SOAP server response components can be achieved using SOAP::Data in the same way as it has been used in the SOAP client.