diff --git a/HttpClientStudy.WebApp/Controllers/AdvancedGetController.cs b/HttpClientStudy.WebApp/Controllers/AdvancedGetController.cs
index 468bb79..85f6717 100644
--- a/HttpClientStudy.WebApp/Controllers/AdvancedGetController.cs
+++ b/HttpClientStudy.WebApp/Controllers/AdvancedGetController.cs
@@ -183,8 +183,9 @@ namespace HttpClientStudy.WebApp.Controllers
         /// </summary>
         /// <returns></returns>
         [HttpPost]
-        public IActionResult PostJsonData([FromBody] AdvancedGetModel vm)
+        public IActionResult PostJsonData([FromBody]AdvancedGetModel? vm = null)
         {
+            
             var result = BaseResultUtil.Success(vm);
             return Ok(result);
         }