CGI::Cookie で複数のcookieをsetするには、list リファレンスを使用

CGI::Cookie - Interface to HTTP Cookies - metacpan.org

以下の通り

1個の場合

#!/usr/local/bin/perl
use strict;
use warnings;
use CGI;
use CGI::Cookie;

main();

sub main {
    my $cgi = CGI->new();

    my $cookie_1 = CGI::Cookie->new(-name    =>  'key_1',
                                    -value   =>  'val_1',
                                    -httponly=>  0);
    print CGI::header(-type=>'text/html',-charset=>'UTF-8',
                      -cookie=>$cookie_1);
    :
}

複数個の場合

#!/usr/local/bin/perl
use strict;
use warnings;
use CGI;
use CGI::Cookie;

main();

sub main {
    my $cgi = CGI->new();

    my $cookie_1 = CGI::Cookie->new(-name    =>  'key_1',
                                    -value   =>  'val_1',
                                    -httponly=>  0);
    my $cookie_2 = CGI::Cookie->new(-name    =>  'key_2',
                                    -value   =>  'val_2',
                                    -httponly=>  1);

    
    print CGI::header(-type=>'text/html',-charset=>'UTF-8',
                      -cookie=>[$cookie_1,$cookie_2]);
    :
}