boilerplate-plugin/routing.yml

# Here we can easily define custom routes. Let's create a "Hello world!" page.
mibew_boilerplate_hello:
    # Relative path from the Mibew web root is used here.
    path: /mibew-boilerplate-hello/{name}
    # Set some defaults for the request
    defaults:
        # This value is special. It tells the system what action should be
        # invoked for the response
        _controller: Mibew\Mibew\Plugin\Boilerplate\Controller\HelloWorldController::indexAction
        # Set a default value for the "{name}" placeholder
        name: world