public FormStateInterface::setResponse(Response $response)
Sets 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 $response: The response to return.
$this
public function setResponse(Response $response);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormStateInterface.php/function/FormStateInterface::setResponse/8.1.x