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  Plack::App::Cascade - Cascadable compound application
  
  =head1 SYNOPSIS
  
    use Plack::App::Cascade;
    use Plack::App::URLMap;
    use Plack::App::File;
  
    # Serve static files from multiple search paths
    my $cascade = Plack::App::Cascade->new;
    $cascade->add( Plack::App::File->new(root => "/www/example.com/foo")->to_app );
    $cascade->add( Plack::App::File->new(root => "/www/example.com/bar")->to_app );
  
    my $app = Plack::App::URLMap->new;
    $app->map("/static", $cascade);
    $app->to_app;
  
  =head1 DESCRIPTION
  
  Plack::App::Cascade is a Plack middleware component that compounds
  several apps and tries them to return the first response that is not
  404.
  
  =head1 METHODS