Frapi前控制器

I'm building a 'Frapi extension' for a university project. I have to code a Front Controller Action that handles all requests. I've tried to set the custom route to "/*" but it doesn't work.

Is there a way to do this?

Here an example

class CustomAction {

   public function executeAction()

    return "test";
   }

}

I want that when I do

curl -X GET -d {} http://api/x.json 
or 
curl -X GET -d {} http://api/y.json
or 
curl -X GET -d {} http://api/xxx/yyy.json
or 
curl -X GET -d {} http://api/kkk/hhh/sss.json

and so on...

then I would have ever "test".