Maybe you want start with LWP::UserAgent, and HTTP::Request, both are core modules coming with standard Perl distribution.
If you are familiar with http 1.1 spec, and socket programming, and are interested in details, you can also play with IO::Socket::INET.
Example:
use LWP::UserAgent;
use HTTP::Request;
use strict;
my $agent = new LWP::UserAgent();
my $req = new HTTP::Request(GET => "http://www.google.com");
my $res = $agent->request($req);
print $res->content if ($res->is_success)
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