public function indexAction()
    {
        /* @var $request \Zend\Http\Request */
        $request = $this->getRequest();
        $this->httpClient->setMethod(Request::METHOD_POST);
        $this->httpClient->setParameterPost(['dsl_text' => $request->getPost('dsl_text')]);
        $response = $this->httpClient->send();

        if (! $response->isSuccess()) {
            throw new \UnexpectedValueException('HTTP Request failed');
        }

        /* @var $redirect \Zend\Mvc\Controller\Plugin\Redirect */
        $redirect = $this->plugin('redirect');

        return $redirect->toUrl('https://yuml.me/' . $response->getBody());
    }