Improved Symfony 6.4 Support

src/DependencyInjection/Configuration.php

@@ -28,8 +28,8 @@ public function getConfigTreeBuilder(): TreeBuilder
                 ->arrayNode('server')
                     ->addDefaultsIfNotSet()
                     ->children()
-                        ->stringNode('name')->defaultValue(self::DEFAULT_NAME)->end()
-                        ->stringNode('version')->defaultValue(self::DEFAULT_VERSION)->end()
+                        ->scalarNode('name')->defaultValue(self::DEFAULT_NAME)->end()
+                        ->scalarNode('version')->defaultValue(self::DEFAULT_VERSION)->end()
                     ->end()
                 ->end()
             ->end();

src/MethodHandler/InitializeMethodHandler.php

@@ -19,7 +19,7 @@
 #[AsMethodHandler(methodName: 'initialize')]
 class InitializeMethodHandler implements MethodHandlerInterface
 {
-    public const string PROTOCOL_VERSION = '2025-03-26';
+    public const string PROTOCOL_VERSION = '2024-11-05';
 
     public function __construct(
         private readonly string $serverName,

src/Service/ResponseFactory.php

@@ -46,6 +46,7 @@ private function createResponse(JsonRpcResponse $response): JsonResponse
     {
         $json = $this->serializer->serialize($response, 'json', [
             AbstractObjectNormalizer::SKIP_NULL_VALUES => true,
+            AbstractObjectNormalizer::PRESERVE_EMPTY_OBJECTS => true,
         ]);
 
         return JsonResponse::fromJsonString($json, JsonResponse::HTTP_OK);