public FormStateInterface::getRedirect()
Gets the value to use for redirecting after the form has been executed.
Return value
mixed The value will be one of the following:
A fully prepared \Symfony\Component\HttpFoundation\RedirectResponse. An instance of \Drupal\Core\Url to use for the redirect. NULL, to signify that no redirect was specified and that the current path should be used for the redirect. FALSE, to signify that no redirect should take place.
See also
\Drupal\Core\Form\FormSubmi