in reply to Good Style for Small Apps

I accept this way: 
#!/usr/bin/env perl
use Mojolicious::Lite;

# Documentation browser under "/perldoc"
plugin 'PODRenderer';

sub validate {
    my $input=shift;
    $input =~ s/\W/_/g;
    return $input;
};

get '/' => sub {
  my $c = shift;
  $c->render('index');
};

get '/view/:ticket' => sub {
    my $c = shift;
    my $ticket = validate($c->param('ticket'));
    $c->render(
        'ticketing',
        ticket => $ticket,
    );
};

app->start;
__DATA__

@@ index.html.ep
% layout 'default';
% title 'Welcome';
Welcome to the Mojolicious real-time web framework!

@@ layouts/default.html.ep
<!DOCTYPE html>
<html>
  <head><title><%= title %></title></head>
  <body><%= content %></body>
</html>

@@ ticketing.html.ep
% layout 'default';
% title 'Ticket Viewing';
    <h1>This is where the business happens for <%= $ticket %></h1>

[download]
./Ticketing get '/view/12312`asdf`'
[Mon Jun 22 13:13:10 2015] [debug] Your secret passphrase needs to be 
+changed!!!
[Mon Jun 22 13:13:10 2015] [debug] GET "/view/12312%60asdf%60".
[Mon Jun 22 13:13:10 2015] [debug] Routing to a callback.
[Mon Jun 22 13:13:10 2015] [debug] Rendering template "ticketing.html.
+ep" from DATA section.
[Mon Jun 22 13:13:10 2015] [debug] Rendering template "layouts/default
+.html.ep" from DATA section.
[Mon Jun 22 13:13:10 2015] [debug] 200 OK (0.011596s, 86.237/s).
<!DOCTYPE html>
<html>
  <head><title>Ticket Viewing</title></head>
  <body>    <h1>This is where the business happens for 12312_asdf_</h1
+>
</body>
</html>

[download]
Using Mojolicious is a great way to do small web apps. They are well encapsulated and contain the primary functionality like logging, templating, debugging. You start out with one file using  mojo generate lite_app <name> and everything (webserver, logic, templates) is in one file. Later there are options for growing into a full fledged module and separating into more manageable aspects if needed.

In Section Seekers of Perl Wisdom