Well, the simplest way would be to use LWP::Simple (as the name implies), or you could use URI::Fetch if you want a bit more control (this actually uses LWP::UserAgent under the hood).

# get content of the page, or die if get() fails
use LWP::Simple;
$content = get('http://www.example.com/some/document.txt');
if (defined $content) { print $content; }
else { die 'get() failed'; }


# get content of page, sending a custom useragent (browser name)
use URI::Fetch;
$object = URI::Fetch->fetch(
  'http://example.com/some/document.txt',
  UserAgent => 'Perl script'
) or die URI::Fetch->errstr;
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