diff --git a/src/sf_proto.h b/src/sf_proto.h
index eda1fc6..fae4055 100644
--- a/src/sf_proto.h
+++ b/src/sf_proto.h
@@ -85,6 +85,9 @@
         int2buff((resp_header).body_len, (proto_header)->body_len);\
     } while (0)
 
+#define SF_PROTO_RESP_BODY(task)  \
+    (task->data + sizeof(SFCommonProtoHeader))
+
 
 typedef struct sf_common_proto_header {
     unsigned char magic[4]; //magic number
@@ -119,6 +122,10 @@ typedef struct sf_proto_get_server_resp {
     char padding[2];
 } SFProtoGetServerResp;
 
+typedef struct sf_proto_empty_body_req {
+    char nothing[0];
+} SFProtoEmptyBodyReq;
+
 typedef struct sf_proto_idempotency_additional_header {
     char req_id[8];
 } SFProtoIdempotencyAdditionalHeader;
diff --git a/src/sf_types.h b/src/sf_types.h
index 480f2ef..239558b 100644
--- a/src/sf_types.h
+++ b/src/sf_types.h
@@ -150,7 +150,7 @@ typedef struct sf_slow_log_context {
 typedef enum sf_data_read_rule {
     sf_data_read_rule_any_available,
     sf_data_read_rule_slave_first,
-    sf_data_read_rule_master_only,
+    sf_data_read_rule_master_only
 } SFDataReadRule;
 
 typedef enum sf_net_retry_interval_mode {
@@ -198,6 +198,11 @@ typedef struct sf_key_value_array {
     int alloc;
 } SFKeyValueArray;
 
+typedef enum sf_server_group_index_type {
+    sf_server_group_index_type_cluster = 1,
+    sf_server_group_index_type_service
+} SFServerGroupIndexType;
+
 typedef struct sf_cluster_config {
     FCServerConfig server_cfg;
     unsigned char md5_digest[16];