ws.pl

use Mojolicious::Lite;

# Route associating "/" with template in DATA section
get '/' => 'title';

# WebSocket service scraping information from remote site
websocket '/scrape' => sub {
  my $c = shift;
  $c->on(message => sub {
    my ($c, $url) = @_;
    my $title = $c->ua->get($url)->res->dom->at('title')->text;
    $c->send($title);
  });
};

app->start;
__DATA__

@@ title.html.ep
% my $websocket = url_for 'scrape';
<script>
  var ws = new WebSocket('<%= $websocket->to_abs %>');
  ws.onmessage = function (event) {
    document.body.innerHTML += event.data;
  };
  ws.onopen = function (event) {
    ws.send('http://mojolicio.us');
  };
</script>