public FormStateInterface::getResponse()
Gets a response for this form.
If a response is set, it will be used during processing and returned directly. The form will not be rebuilt or redirected.
\Symfony\Component\HttpFoundation\Response|null The response to return, or NULL.
public function getResponse();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormStateInterface.php/function/FormStateInterface::getResponse/8.1.x