Drupal. Services Q&A :: Page 1
What is the difference between \Drupal::request()->getSession() and \Drupal::service('user.private_tempstore')?
Creating a simple Drupal 8 custom service - argument should be an instance of a class, recognised as an array
Request header field X-CSRF-Token is not allowed by Access-Control-Allow-Headers in preflight response for Drupal 7 REST API