diff --git a/core/lib/Drupal/Component/HttpFoundation/SecuredRedirectResponse.php b/core/lib/Drupal/Component/HttpFoundation/SecuredRedirectResponse.php
index 0aaf3de..77d8e8c 100644
--- a/core/lib/Drupal/Component/HttpFoundation/SecuredRedirectResponse.php
+++ b/core/lib/Drupal/Component/HttpFoundation/SecuredRedirectResponse.php
@@ -7,17 +7,15 @@
 
 namespace Drupal\Component\HttpFoundation;
 
-use Drupal\Component\Utility\UrlHelper;
-use Drupal\Core\Routing\RequestContext;
 use \Symfony\Component\HttpFoundation\RedirectResponse;
 
 /**
  * Provides a common base class for safe redirects.
  *
  * In case you want to redirect to external URLs use
- * \Drupal\Core\Routing\TrustedRedirectResponse.
+ * TrustedRedirectResponse.
  *
- * For local URLs we use \Drupal\Core\Routing\LocalRedirectResponse which opts
+ * For local URLs we use LocalRedirectResponse which opts
  * out of external redirects.
  */
 abstract class SecuredRedirectResponse extends RedirectResponse {
@@ -26,7 +24,7 @@
    * Copies an existing redirect response into a safe one.
    *
    * The safe one cannot accidentally redirect to an external URL, unless
-   * actively wanted (see \Drupal\Core\Routing\TrustedRedirectResponse).
+   * actively wanted (see TrustedRedirectResponse).
    *
    * @param \Symfony\Component\HttpFoundation\RedirectResponse $response
    *   The original redirect.
@@ -51,43 +49,12 @@ public function setTargetUrl($url) {
   }
 
   /**
-   * {@inheritdoc}
-   */
-  protected function isSafe($url) {
-    return !UrlHelper::isExternal($url) || UrlHelper::externalIsLocal($url, $this->getRequestContext()->getCompleteBaseUrl());
-  }
-
-  /**
-   * The request context.
+   * Returns whether the URL is considered as safe to redirect to.
    *
-   * @var \Drupal\Core\Routing\RequestContext
-   */
-  protected $requestContext;
-
-  /**
-   * Returns the request context.
+   * @param string $url
    *
-   * @return \Drupal\Core\Routing\RequestContext
+   * @return bool
    */
-  protected function getRequestContext() {
-    if (!isset($this->requestContext)) {
-      $this->requestContext = \Drupal::service('router.request_context');
-    }
-    return $this->requestContext;
-  }
-
-  /**
-   * Sets the request context.
-   *
-   * @param \Drupal\Core\Routing\RequestContext $request_context
-   *   The request context.
-   *
-   * @return $this
-   */
-  public function setRequestContext(RequestContext $request_context) {
-    $this->requestContext = $request_context;
-
-    return $this;
-  }
+  abstract protected function isSafe($url);
 
 }
diff --git a/core/lib/Drupal/Core/Routing/LocalRedirectResponse.php b/core/lib/Drupal/Core/Routing/LocalRedirectResponse.php
index 56b8a62..f6d4565 100644
--- a/core/lib/Drupal/Core/Routing/LocalRedirectResponse.php
+++ b/core/lib/Drupal/Core/Routing/LocalRedirectResponse.php
@@ -15,4 +15,6 @@
  */
 class LocalRedirectResponse extends SecuredRedirectResponse {
 
+  use SecuredRedirectResponseTrait;
+
 }
diff --git a/core/lib/Drupal/Core/Routing/SecuredRedirectResponseTrait.php b/core/lib/Drupal/Core/Routing/SecuredRedirectResponseTrait.php
new file mode 100644
index 0000000..8cf4d76
--- /dev/null
+++ b/core/lib/Drupal/Core/Routing/SecuredRedirectResponseTrait.php
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Routing\SecuredRedirectResponseTrait.
+ */
+
+namespace Drupal\Core\Routing;
+
+use Drupal\Component\Utility\UrlHelper;
+
+/**
+ * Class SecuredRedirectResponseTrait
+ * @package Drupal\Core\Routing
+ */
+trait SecuredRedirectResponseTrait {
+
+  /**
+   * The request context.
+   *
+   * @var \Drupal\Core\Routing\RequestContext
+   */
+  protected $requestContext;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function isSafe($url) {
+    return !UrlHelper::isExternal($url) || UrlHelper::externalIsLocal($url, $this->getRequestContext()->getCompleteBaseUrl());
+  }
+
+  /**
+   * Returns the request context.
+   *
+   * @return \Drupal\Core\Routing\RequestContext
+   */
+  protected function getRequestContext() {
+    if (!isset($this->requestContext)) {
+      $this->requestContext = \Drupal::service('router.request_context');
+    }
+    return $this->requestContext;
+  }
+
+  /**
+   * Sets the request context.
+   *
+   * @param \Drupal\Core\Routing\RequestContext $request_context
+   *   The request context.
+   *
+   * @return $this
+   */
+  public function setRequestContext(RequestContext $request_context) {
+    $this->requestContext = $request_context;
+
+    return $this;
+  }
+
+}
diff --git a/core/lib/Drupal/Core/Routing/TrustedRedirectResponse.php b/core/lib/Drupal/Core/Routing/TrustedRedirectResponse.php
index 5ce1c50..905369f 100644
--- a/core/lib/Drupal/Core/Routing/TrustedRedirectResponse.php
+++ b/core/lib/Drupal/Core/Routing/TrustedRedirectResponse.php
@@ -17,6 +17,10 @@
  */
 class TrustedRedirectResponse extends SecuredRedirectResponse {
 
+  use SecuredRedirectResponseTrait {
+    SecuredRedirectResponseTrait::isSafe as traitIsSafe;
+  }
+
   /**
    * @todo Document.
    */
@@ -47,7 +51,7 @@ public function setTrustedTargetUrl($url) {
    * {@inheritdoc}
    */
   protected function isSafe($url) {
-    return !empty($this->trustedUrls[$url]) || parent::isSafe($url);
+    return !empty($this->trustedUrls[$url]) || $this->traitIsSafe($url);
   }
 
 }