You could write your access logger like this:

sub startup {
  # ...
  my $r_begin = $self->routes;

  my $r = $r_begin->under('' => sub {
    my $c = shift;
    my $params = $c->req->params->to_hash;
    # do your logging here
  });

  #
  # your endpoints here
  #

  # catch-all route at end, your fancy 404 page and also place for log
+ging
  $r->any('/*whatever' => {whatever => ''} => sub {
    my $c = shift;
    my $message = 'PAGE 404 '.$c->tx->{original_remote_address}." ".$c
+->tx->req->url;
    $self->app->log->debug($message); # . Dumper($c->tx)
    $c->render(status => 404, text => $message);
  });
}
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