Mojolicious Perl

use Mojolicious::Lite -signatures;
use Mojo::Util qw(b64_decode);

my $gif = b64_decode('R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==');

get '/pixel.gif' => sub ($c) {
  $c->res->headers->cache_control('no-store');
  $c->render(data => $gif, format => 'gif');
};

app->start;