fix(api): 🐛 Correctly return empty body without content-type headers, when returning empty responses

api/inbox/index.ts

@@ -65,7 +65,7 @@ export default apiRoute((app) =>
             ip: context.env.ip ?? null,
         });
 
-        return context.newResponse(
+        return context.body(
             "Request processing initiated.\nImplement the Instance Messaging Extension to receive any eventual feedback (errors, etc.)",
             200,
         );