วิธี get base url ของ Drupal 8
$host = \Drupal::request()->getHost(); ==> drupal.dev
$host = \Drupal::request()->getSchemeAndHttpHost(); ==> http://drupal.dev
$host = \Drupal::request()->getHost(); ==> drupal.dev
$host = \Drupal::request()->getSchemeAndHttpHost(); ==> http://drupal.dev