public function handle(ServerRequestInterface $request): ResponseInterface
    {
        $module_name = $request->getQueryParams()['module'] ?? $request->getParsedBody()['module'] ?? '';
        $action      = $request->getQueryParams()['action'] ?? $request->getParsedBody()['action'] ?? '';

        // Check that the module is enabled.
        // The module itself will need to check any tree-level access,
        // which may be different for each component (tab, menu, etc.) of the module.
        $module = $this->module_service->findByName($module_name);

        if ($module === null) {
            throw new NotFoundHttpException('Module ' . $module_name . ' does not exist');
        }

        // We'll call a function such as Module::getFooBarAction()
        $verb   = strtolower($request->getMethod());
        $method = $verb . $action . 'Action';

        // Actions with "Admin" in the name are for administrators only.
        if (strpos($action, 'Admin') !== false && !Auth::isAdmin($this->user)) {
            throw new AccessDeniedHttpException('Admin only action');
        }

        if (!method_exists($module, $method)) {
            throw new NotFoundHttpException('Method ' . $method . '() not found in ' . $module_name);
        }

        return app()->dispatch($module, $method);
    }