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diff --git a/web/core/modules/big_pipe/big_pipe.module b/web/core/modules/big_pipe/big_pipe.module
new file mode 100644
index 000000000..fa0518ad3
--- /dev/null
+++ b/web/core/modules/big_pipe/big_pipe.module
@@ -0,0 +1,78 @@
+<?php
+
+/**
+ * @file
+ * Adds BigPipe no-JS detection.
+ */
+
+use Drupal\big_pipe\Render\Placeholder\BigPipeStrategy;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\Url;
+
+/**
+ * Implements hook_help().
+ */
+function big_pipe_help($route_name, RouteMatchInterface $route_match) {
+  switch ($route_name) {
+    case 'help.page.big_pipe':
+      $output = '<h3>' . t('About') . '</h3>';
+      $output .= '<p>' . t('The BigPipe module sends pages with dynamic content in a way that allows browsers to show them much faster. For more information, see the <a href=":big_pipe-documentation">online documentation for the BigPipe module</a>.', [':big_pipe-documentation' => 'https://www.drupal.org/documentation/modules/big_pipe']) . '</p>';
+      $output .= '<h3>' . t('Uses') . '</h3>';
+      $output .= '<dl>';
+      $output .= '<dt>' . t('Speeding up your site') . '</dt>';
+      $output .= '<dd>' . t('The module requires no configuration. Every part of the page contains metadata that allows BigPipe to figure this out on its own.') . '</dd>';
+      $output .= '</dl>';
+
+      return $output;
+  }
+}
+
+/**
+ * Implements hook_page_attachments().
+ *
+ * @see \Drupal\big_pipe\Controller\BigPipeController::setNoJsCookie()
+ */
+function big_pipe_page_attachments(array &$page) {
+  // Routes that don't use BigPipe also don't need no-JS detection.
+  if (\Drupal::routeMatch()->getRouteObject()->getOption('_no_big_pipe')) {
+    return;
+  }
+
+  $request = \Drupal::request();
+  // BigPipe is only used when there is an actual session, so only add the no-JS
+  // detection when there actually is a session.
+  // @see \Drupal\big_pipe\Render\Placeholder\BigPipeStrategy.
+  $session_exists = \Drupal::service('session_configuration')->hasSession($request);
+  $page['#cache']['contexts'][] = 'session.exists';
+  // Only do the no-JS detection while we don't know if there's no JS support:
+  // avoid endless redirect loops.
+  $has_big_pipe_nojs_cookie = $request->cookies->has(BigPipeStrategy::NOJS_COOKIE);
+  $page['#cache']['contexts'][] = 'cookies:' . BigPipeStrategy::NOJS_COOKIE;
+  if ($session_exists) {
+    if (!$has_big_pipe_nojs_cookie) {
+      // Let server set the BigPipe no-JS cookie.
+      $page['#attached']['html_head'][] = [
+        [
+          // Redirect through a 'Refresh' meta tag if JavaScript is disabled.
+          '#tag' => 'meta',
+          '#noscript' => TRUE,
+          '#attributes' => [
+            'http-equiv' => 'Refresh',
+            'content' => '0; URL=' . Url::fromRoute('big_pipe.nojs', [], ['query' => \Drupal::service('redirect.destination')->getAsArray()])->toString(),
+          ],
+        ],
+        'big_pipe_detect_nojs',
+      ];
+    }
+    else {
+      // Let client delete the BigPipe no-JS cookie.
+      $page['#attached']['html_head'][] = [
+        [
+          '#tag' => 'script',
+          '#value' => 'document.cookie = "' . BigPipeStrategy::NOJS_COOKIE . '=1; path=/; expires=Thu, 01 Jan 1970 00:00:00 GMT"',
+        ],
+        'big_pipe_detect_js',
+      ];
+    }
+  }
+}