Trying to programmatically redirect

Question

I’m trying to redirect users in Drupal 8 as I was used to do in Drupal 7 with a simple drupal_goto().

This is my code.

$response = new \Symfony\Component\HttpFoundation\RedirectResponse(\Drupal::url($url_redirect));
$response->send();

Executing it, I get the following error:

Symfony\Component\Routing\Exception\RouteNotFoundException: Route http://mydomain.es/participar?utm_source=RTB&utm_campaign=&utm_medium=banner&utm_term=1 does not exist.

The alias /participar exists. What am I doing wrong?

Answer 1

See drupal_goto() has been removed.

Drupal 8 (procedural)

use Symfony\Component\HttpFoundation\RedirectResponse;

function my_menu_callback_foo() {
  //....
  return new RedirectResponse(\Drupal::url('user.page'));
}

Drupal 8 (properly injected)

use Drupal\Core\Controller\ControllerBase;

class MyControllerClass extends ControllerBase {

  public function foo() {
    //...
    return $this->redirect('user.page');
  }
}

If the route name is not known use RedirectResponse with a URL. When redirecting to an external location, use TrustedRedirectResponse.

use Drupal\Core\Controller\ControllerBase;

class MyControllerClass extends ControllerBase {

  public function foo() {
    //...
    return new TrustedRedirectResponse('https://example.com/some/path'); // for eg. Url::fromUserInput(\Drupal::destination()->get())->setAbsolute()->toString();
  }
}