Add ResponseInterface::prepare() step to pre-process responses according to the request

formwork/src/App.php

@@ -138,9 +138,11 @@ final class App
 
         DynamicFieldValue::$vars = $this->container->call(require $this->config()->get('system.fields.dynamic.vars.file'));
 
+        $request = $this->request();
+
         $response = $this->router()->dispatch();
 
-        $response->send();
+        $response->prepare($request)->send();
 
         return $response;
     }

formwork/src/ErrorHandlers.php

@@ -34,11 +34,11 @@ class ErrorHandlers
         Response::cleanOutputBuffers();
 
         if ($this->request->isXmlHttpRequest()) {
-            JsonResponse::error('Error', $responseStatus)->send();
+            JsonResponse::error('Error', $responseStatus)->prepare($this->request)->send();
         } else {
             $view = $this->viewFactory->make('errors.error', ['status' => $responseStatus->code(), 'message' => $responseStatus->message(), 'throwable' => $throwable]);
             $response = new Response($view->render(), $responseStatus);
-            $response->send();
+            $response->prepare($this->request)->send();
             // Don't exit, otherwise the error will not be logged
         }
     }

formwork/src/Http/Response.php

@@ -56,6 +56,14 @@ class Response implements ResponseInterface
         return $this->headers;
     }
 
+    /**
+     * Prepare response according to the given HTTP request
+     */
+    public function prepare(Request $request): static
+    {
+        return $this;
+    }
+
     /**
      * Send HTTP status
      */

formwork/src/Http/ResponseInterface.php

@@ -35,6 +35,11 @@ interface ResponseInterface extends ArraySerializable
      */
     public function headers(): array;
 
+    /**
+     * Prepare response according to the given HTTP request
+     */
+    public function prepare(Request $request): static;
+
     /**
      * Send HTTP status
      */

formwork/src/Panel/Controllers/AbstractController.php

@@ -224,6 +224,7 @@ abstract class AbstractController extends BaseAbstractController
         if (!$this->user()->permissions()->has($permission)) {
             $this->container->build(ErrorsController::class)
                 ->forbidden()
+                ->prepare($this->request)
                 ->send();
             exit;
         }

formwork/src/Services/Loaders/PanelServiceLoader.php

@@ -66,7 +66,7 @@ class PanelServiceLoader implements ResolutionAwareServiceLoaderInterface
         if ($service->isLoggedIn() && $this->config->get('system.errors.setHandlers')) {
             $errorsController = $this->container->build(ErrorsController::class);
             set_exception_handler(function (Throwable $throwable) use ($errorsController): never {
-                $errorsController->internalServerError($throwable)->send();
+                $errorsController->internalServerError($throwable)->prepare($this->request)->send();
                 throw $throwable;
             });
         }