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Or using L<IO::File::WithPath>

  my $fh = IO::File::WithPath->new($file, 'r');

And then passing the filehandle to body and setting headers, if needed.

  $c->response->body($fh);
  $c->response->headers->content_type('text/plain');
  $c->response->headers->content_length(-s $file);
  $c->response->headers->last_modified((stat($file))[9]);

L<Plack::Middleware::XSendfile> can be loaded in the application so:

 __PACKAGE__->config(
     psgi_middleware => [
         'XSendfile',
         # other middlewares here...
        ],
 );