Neos\Flow\Http\Response::getContent PHP Method

    public function getContent()
    {
        return $this->content;
    }

 /**
  * Render this form.
  *
  * @return string rendered form
  * @api
  * @throws \Neos\Form\Exception\RenderingException
  */
 public function render()
 {
     if ($this->isAfterLastPage()) {
         $this->invokeFinishers();
         return $this->response->getContent();
     }
     $this->formState->setLastDisplayedPageIndex($this->currentPage->getIndex());
     if ($this->formDefinition->getRendererClassName() === null) {
         throw new \Neos\Form\Exception\RenderingException(sprintf('The form definition "%s" does not have a rendererClassName set.', $this->formDefinition->getIdentifier()), 1326095912);
     }
     $rendererClassName = $this->formDefinition->getRendererClassName();
     $renderer = new $rendererClassName();
     if (!$renderer instanceof \Neos\Form\Core\Renderer\RendererInterface) {
         throw new \Neos\Form\Exception\RenderingException(sprintf('The renderer "%s" des not implement RendererInterface', $rendererClassName), 1326096024);
     }
     $controllerContext = $this->getControllerContext();
     $renderer->setControllerContext($controllerContext);
     $renderer->setFormRuntime($this);
     return $renderer->renderRenderable($this);
 }