Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/basic_auth/basic_auth.module

@@ -0,0 +1,21 @@
+<?php
+
+/**
+ * @file
+ * Provides an HTTP Basic authentication provider.
+ */
+
+use Drupal\Core\Routing\RouteMatchInterface;
+
+/**
+ * Implements hook_help().
+ */
+function basic_auth_help($route_name, RouteMatchInterface $route_match) {
+  switch ($route_name) {
+    case 'help.page.basic_auth':
+      $output = '';
+      $output .= '<h3>' . t('About') . '</h3>';
+      $output .= '<p>' . t('The HTTP Basic Authentication module supplies an <a href="http://en.wikipedia.org/wiki/Basic_access_authentication">HTTP Basic authentication</a> provider for web service requests. This authentication provider authenticates requests using the HTTP Basic Authentication username and password, as an alternative to using Drupal\'s standard cookie-based authentication system. It is only useful if your site provides web services configured to use this type of authentication (for instance, the <a href="!rest_help">RESTful Web Services module</a>). For more information, see <a href="!hba_do">the online documentation for the HTTP Basic Authentication module</a>.', array('!hba_do' => 'https://www.drupal.org/documentation/modules/basic_auth', '!rest_help' => (\Drupal::moduleHandler()->moduleExists('rest')) ? \Drupal::url('help.page', array('name' => 'rest')) : '#')) . '</p>';
+      return $output;
+  }
+}