later.pl

#!/usr/bin/env perl

use Mojolicious::Lite;

get '/' => sub {
    my $c = shift;

    $c->session(foo => 'bar');

    $c->render_later;

    $c->client->async->get(
        'http://mojolicio.us' => sub {  $c->render(data => shift->res->body); }
    )->start;
};

app->start;