Controller/FormWebsiteController.php
private function handleFormOnlySubmit(Request $request, $type)
    {
        // handle form submit
        $configuration = $this->get('sulu_form.configuration.form_configuration_factory')->buildByType(
            $type,
            $this->form->getData(),
            $request->getLocale(),
            []
        );

        if ($this->get('sulu_form.handler')->handle($this->form, $configuration)) {
            return new RedirectResponse('?send=true');
        }
    }
private function handleFormOnlySubmit(Request $request, $type)
    {
        // handle form submit
        $configuration = $this->get('sulu_form.configuration.form_configuration_factory')->buildByType(
            $type,
            $this->form->getData(),
            $request->getLocale(),
            []
        );

        if ($this->get('sulu_form.handler')->handle($this->form, $configuration)) {
            return new RedirectResponse('?send=true');
        }
    }
Handle form only submit.

@param Request $request
@param AbstractType $type

@return RedirectResponse