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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