apigility

class MyResource extends AbstractResourceListener implements ResourceInterface
{
    public function fetch($id)
    {
        $entity = $this->getEntityById($id, false);
        if ($entity === null) {
            return new ApiProblemResponse(new ApiProblem(404, 'Entity with ID ' . $id . ' not found'));
        }

        return $entity;
    }
}

gistfile1.php

case 'get':
                $id = $this->getIdentifier($routeMatch, $request);
                if ($id !== false) {
                    $action = 'get';
                    $return = $this->get($id);
                    break;
                }
                $action = 'getList';
                $return = $this->getList();
                break;
            // HEAD
            case 'head':
                $id = $this->getIdentifier($routeMatch, $request);
                if ($id === false) {
                    $id = null;
                }
                $action = 'head';
                $this->head($id);
                $response = $e->getResponse();
                $response->setContent('');
                $return = $response;
                break;