My site is on http://drupal8.local/. How do I get the drupal8.local part of that URL?
Url::fromRoute('<'current'>') or base_path() returns the path parth of the URL; For example, for http://drupal8.local/a/b/c/d/e/f, they return '/a/b/c/d/e/f' when I just need to get 'drupal8.local'.
How can I get that part of the URL?
You can get the hostname, "drupal8.local", directly from the getHost() request:
$host = \Drupal::request()->getHost(); In some cases you might want to get the schema as well, fx https://drupal8.local:
$host = \Drupal::request()->getSchemeAndHttpHost(); 
\Drupal::request()->getSchemeAndHttpHost() will return http://drupal8.local. Url::fromRoute('<front>', [], ['absolute' => TRUE]); There are some warnings about directly accessing the request object in this way in \Drupal::request:
* Note: The use of this wrapper in particular is especially discouraged. Most * code should not need to access the request directly. Doing so means it * will only function when handling an HTTP request, and will require special * modification or wrapping when run from a command line tool, from certain * queue processors, or from automated tests. * * If code must access the request, it is considerably better to register * an object with the Service Container and give it a setRequest() method * that is configured to run when the service is created. That way, the * correct request object can always be provided by the container and the * service can still be unit tested. Any form controller extending \Drupal\Core\Form\FormBase automatically has this dependency injected, and it may be accessed using:
$this->getRequest()->getSchemeAndHttpHost() I think (but haven't tested) that a regular page controller extending \Drupal\Core\Controller\ControllerBase could provide the request_stack service by overriding the \Drupal\Core\Controller\ControllerBase::create function, and then setting a $request property in the constructor. This is described really well for forms, and the same process should apply for page controllers: https://www.drupal.org/docs/8/api/services-and-dependency-injection/dependency-injection-for-a-form.
If you'd like to do this with dependency injection and a service, then you can use RequestStack:
use Symfony\Component\HttpFoundation\RequestStack; And define it like this:
protected $request; public function __construct(..., RequestStack $request_stack) { ... $this->request = $request_stack->getCurrentRequest(); } public static function create(ContainerInterface $container, ...) { return new static( ... $container->get('request_stack') ) } And then declare it like this:
$this->request->getHost() $this->request->getSchemeAndHttpHost() Taking into account the "warnings about directly accessing the request object in this way in \Drupal::request" that Shaun Dychko mentioned, perhaps a good option to get the hostname is obtain it from the $base_url global variable, with the help of php function parse_url:
global $base_url; $base_url_parts = parse_url($base_url); $host = $base_url_parts['host']; Code below is how core defines the [site:url] token. This works best in all cases for me in drupal 8 & 9:
$url_options = [ 'absolute' => TRUE, 'language' => \Drupal::languageManager()->getCurrentLanguage(), ]; $site_url = Url::fromRoute('<front>', [], $url_options)->toString(); 
<?php $url = \Drupal\Core\Url::fromUserInput('/', ['absolute' => TRUE])->toString(); ?> 
\Drupal::request()->getBaseUrl() 