[SR-Users] [http_client] KEMI use "curl_connect_post" send http request error

ALL: Hi, here is my lua script: ``` local body = '{"ip":"172.16.4.111", "ports":[5261, 5260]}' local resp = "" local code = KSR.http_client.curl_connect_post("configapi", "", "application/json", body, resp) ``` the error is : ``` 24(2406) DEBUG: app_lua [app_lua_api.c:1024]: sr_kemi_lua_exec_func_ex(): param[0] for: curl_connect_post is str: configapi 24(2406) DEBUG: app_lua [app_lua_api.c:1024]: sr_kemi_lua_exec_func_ex(): param[1] for: curl_connect_post is str: 24(2406) DEBUG: app_lua [app_lua_api.c:1024]: sr_kemi_lua_exec_func_ex(): param[2] for: curl_connect_post is str: application/json 24(2406) DEBUG: app_lua [app_lua_api.c:1024]: sr_kemi_lua_exec_func_ex(): param[3] for: curl_connect_post is str: {"ip":"172.16.4.111", "ports":[5261, 5260]} 24(2406) DEBUG: app_lua [app_lua_api.c:1024]: sr_kemi_lua_exec_func_ex(): param[4] for: curl_connect_post is str: 24(2406) ERROR: <core> [core/pvapi.c:429]: pv_cache_get(): invalid parameters 24(2406) ERROR: http_client [http_client.c:739]: ki_curl_connect_post(): failed to get pv spec for: ``` I know the error means: "resp" type is not right, what is the correct type ? I search google for this issue, no one knows, someone please help me. Thinks