fix(graphql): temporary fix for GET-based GraphQL queries

packages/composer/amazeelabs/silverback_graphql_persisted/silverback_graphql_persisted.services.yml

@@ -0,0 +1,5 @@
+services:
+  fix_graphql_caching_subscriber:
+    class: Drupal\silverback_graphql_persisted\EventSubscriber\FixGraphQLCachingSubscriber
+    tags:
+      - { name: event_subscriber }

packages/composer/amazeelabs/silverback_graphql_persisted/src/EventSubscriber/FixGraphQLCachingSubscriber.php

@@ -0,0 +1,27 @@
+<?php
+namespace Drupal\silverback_graphql_persisted\EventSubscriber;
+
+use Drupal\graphql\Event\OperationEvent;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+
+/**
+ * Fix GraphQL caching when internal page cache is active:
+ *
+ * TODO:
+ * Can be removed when https://github.com/drupal-graphql/graphql/pull/1317 is
+ * resolved.
+ */
+class FixGraphQLCachingSubscriber implements EventSubscriberInterface {
+
+  public function onBeforeOperation(OperationEvent $event): void {
+    $event->getContext()->addCacheContexts(
+      ['url.query_args:variables', 'url.query_args:extensions']
+    );
+  }
+
+  public static function getSubscribedEvents() {
+    return [
+      OperationEvent::GRAPHQL_OPERATION_BEFORE => 'onBeforeOperation',
+    ];
+  }
+}