How can I make Perl Dancer display my index page properly when the back button is used?

Question

When I fill out a form, press submit, and get the results page everything works perfectly. When I want to go back an fill out a new form the page is broken. It seems to be an amalgam of the index page and the results page. The only way I can get it to work is to re-start the Dancer web engine. Here is a copy of the pm that handles the routes:

package NNSP;
use Dancer2;
use Template;

our $VERSION = '0.1';

get '/' => sub {
     template 'index';
};

post '/' => sub {
     set layout => 'result_format';
     template 'result';
};

true;

Answer 1

I think it's better do

template 'result', $hashref, {layout => 'result_format'};

instead of set layout => 'result_format';

or you should do

set layout => 'default_layout'; in hook 'before' or 'before_template' as set sets global parameters.