getStringBody -> getBody

src/Http/Response.php

@@ -510,7 +510,7 @@ class Response implements ResponseInterface
             $this->_file = null;
             $this->_fileRange = [];
         } else {
-            $this->_sendContent($this->getStringBody());
+            $this->_sendContent($this->getBody());
         }
 
         if (function_exists('fastcgi_finish_request')) {

src/Routing/Dispatcher.php

@@ -65,7 +65,7 @@ class Dispatcher
         $actionDispatcher = new ActionDispatcher(null, $this->getEventManager(), $this->_filters);
         $response = $actionDispatcher->dispatch($request, $response);
         if ($request->getParam('return', null) !== null) {
-            return $response->getStringBody();
+            return $response->getBody();
         }
 
         return $response->send();