fix

@@ -50,7 +50,7 @@ public class GrassTopicController {
 
     @RequestMapping("/grassTopicByGroupId")
     @ResponseBody
-    public ApiResponse grassTopicByGroupId(GrassTopicReq req){
+    public ApiResponse grassTopicByGroupId(@RequestBody GrassTopicReq req){
         List<TopicRespBo> resp  = topicService.grassTopicByGroupId(req);
         return new ApiResponse.ApiResponseBuilder().data(resp).build();
     }