That works (thank you), although (somewhat oddly) all of the cookies (multiple headers with the same field name) are run together.

for my $header ($response->headers->header_field_names) {
        print $header, ": ", $response->header($header), "\n";
}
[download]

That produces:

[...]

Set-Cookie: cookiea; expires=[time]; path=/; domain=.example.comcookie
+b expires=[time]; path=/; domain=.example.comcookiec expires=[time]; 
+path=/; domain=.example.com; HttpOnly

[...]
[download]

I can live with that for now.