\Drupal::request() vs $request_stack->getCurrentRequest()

How to get the current request object:

Procedural

In procedural code get the request from the static wrapper \Drupal:

$request = \Drupal::request(); 

Service

In a service get the current request from the injected argument @request_stack:

The module_name/module_name.services.yml file :

services: custom.service: class: Drupal\module_name\Service\CustomService arguments: - '@request_stack' 

The module_name/src/Service/CustomService.php file :

use Symfony\Component\HttpFoundation\RequestStack; /** @var \Symfony\Component\HttpFoundation\RequestStack */ protected $requestStack; class customService { public function __construct(RequestStack $requestStack) { $this->requestStack = $requestStack; } public function doSomething() { // use $this->requestStack->getCurrentRequest() } } 

Controller

In a controller you can pull the request from the route argument stack by including a typed request parameter. An example from UserController:

use Symfony\Component\HttpFoundation\Request; public function resetPass(Request $request, $uid, $timestamp, $hash) { // use $request } 

It's not necessary to define the route parameter in the route definition. The request is always available.

Form

In a form method get the request from getRequest():

 public function submitForm(array &$form, FormStateInterface $form_state) { $request = $this->getRequest(); ... } 

Don't use the injected requestStack property directly, because it is not available for all Form API callbacks.