my $host = 'localhost';
my $path = '/cgi-bin/second.pl';
my $port = 80;

##</code><code>##

my $CONN = IO::Socket::INET->new("$host:$port")
   or die "Couldn't connect: $!";

##</code><code>##

my $req = "GET $path HTTP/1.0 $CRLF$CRLF";
$CONN->syswrite($req);
##</code><code>##

$/ = CRLF . CRLF;   #To read the whole header as one 'line'
binmode $CONN;      #Turn off \n conversion for getline() in next line

my $header = $CONN->getline;
$header =~ s/$CRLF/\n/g;
say $header;

--output:--
HTTP/1.1 200 OK
Date: Sun, 21 Feb 2010 12:28:24 GMT
Server: Apache/2.2.4 (Unix) mod_ssl/2.2.4 OpenSSL/0.9.7l DAV/2 PHP/5.2.3 mod_python/3.3.1 Python/2.4.4
Content-Length: 294
Connection: close
Content-Type: text/html

##</code><code>##

my $CONN = IO::Socket::INET->new(
    Peerhost    => $host,
    Peerport    => 'http(80)',
) or die "Couldn't connect: $!";

##</code><code>##

Use of uninitialized value $header in substitution (s///) at 4perl.pl line 55.
Use of uninitialized value $header in say at 4perl.pl line 56.

##</code><code>##

use strict;
use warnings;
use 5.010;

use IO::Socket qw{ :DEFAULT :crlf };

my $host = 'localhost';
my $path = '/cgi-bin/second.pl';
my $port = 80;

=pod
my $CONN = IO::Socket::INET->new("$host:$port")
    or die "Couldn't connect: $!";
=cut

my $CONN = IO::Socket::INET->new(
    Peerhost    => $host,
    Peerport    => 'http(80)',
) or die "Couldn't connect: $!";

my $req = "GET $path HTTP/1.0 $CRLF$CRLF";
$CONN->syswrite($req);

$/ = CRLF . CRLF; #To read whole header as one 'line'
binmode $CONN; #turn off \n conversion for getline() below

my $header = $CONN->getline;
$header =~ s/$CRLF/\n/g;
say $header;

$CONN->close;