• get
• plackup
• to_app
• psgi

Create an empty directory where you can put your files.

Create a file called app.psgi in that directory with the following content.

The get keyword creates a so-called route that maps a URL path onto an anonymous subroutine. In this case we mapped the root page /.

Whatever the function returns will be returned to the browser. By default as HTML.

Then the to_app call basically provides a running application to plack which is a small web-server used for development purposes.

package App;
use Dancer2;

get '/' => sub {
    return 'Hello World!';
};

App->to_app;

You might have noticed I did not add use strict and use warnings to this code. That's because Dancer2 loads both of them by default.