#!/usr/local/bin/perl
use WebApp;
my $webapp = WebApp->new();
$webapp->param( 'var1' => 'val1' );
$webapp->param( 'var2' => 'val2' );
$webapp->run;

##</code><code>##

package WebApp;
use base 'CGI::Application';
use strict;
use warnings;

my ( $var1, $var2 );

sub setup {
   my $self = shift;
   $self->start_mode( 'my_page' );
   $self->run_modes([
      'my_page'
   ]);
   $var1 = $self->param( 'var1' );
}

sub my_page {
   my $self = shift;
   $var2 = $self->param( 'var2' );
   return "<p>var1: '$var1'</p>\n" .
          "<p>var2: '$var2'</p>\n";
}

1;

##</code><code>##

<p>var1: ''</p>
<p>var2: 'val2'</p>