diff --git a/Classes/Controller/BackendController.php b/Classes/Controller/BackendController.php
index 6f1d9e3..91c2a62 100644
--- a/Classes/Controller/BackendController.php
+++ b/Classes/Controller/BackendController.php
@@ -147,6 +147,9 @@ protected function request($url, $body)
             $url,
             'GET',
             [
+                'headers' => [
+                    'content-type' => 'application/json',
+                ],
                 'body' => $body ?: '',
                 'http_errors' => false,
             ]