diff --git a/src/sf_global.c b/src/sf_global.c
index d4aff47..b13ef9a 100644
--- a/src/sf_global.c
+++ b/src/sf_global.c
@@ -439,6 +439,8 @@ static int load_rdma_apis(SFNetworkHandler *handler)
         return EFAULT;
     }
 
+    LOAD_API(handler, get_connection_size);
+    LOAD_API(handler, init_connection);
     LOAD_API(handler, create_server);
     LOAD_API(handler, close_server);
     LOAD_API(handler, accept_connection);
diff --git a/src/sf_nio.c b/src/sf_nio.c
index c465286..9d0c98a 100644
--- a/src/sf_nio.c
+++ b/src/sf_nio.c
@@ -654,24 +654,7 @@ ssize_t sf_socket_recv_data(struct fast_task_info *task, SFCommAction *action)
             return bytes;
         }
 
-        if (SF_CTX->set_body_length(task) != 0) {
-            return -1;
-        }
-        if (task->length < 0) {
-            logError("file: "__FILE__", line: %d, "
-                    "client ip: %s, pkg length: %d < 0",
-                    __LINE__, task->client_ip,
-                    task->length);
-            return -1;
-        }
-
-        task->length += SF_CTX->header_size;
-        if (task->length > g_sf_global_vars.max_pkg_size) {
-            logError("file: "__FILE__", line: %d, "
-                    "client ip: %s, pkg length: %d > "
-                    "max pkg size: %d", __LINE__,
-                    task->client_ip, task->length,
-                    g_sf_global_vars.max_pkg_size);
+        if (sf_set_body_length(task) != 0) {
             return -1;
         }
 
diff --git a/src/sf_nio.h b/src/sf_nio.h
index 7b35415..026d4f4 100644
--- a/src/sf_nio.h
+++ b/src/sf_nio.h
@@ -92,6 +92,32 @@ void sf_task_switch_thread(struct fast_task_info *task,
 
 void sf_task_detach_thread(struct fast_task_info *task);
 
+static inline int sf_set_body_length(struct fast_task_info *task)
+{
+    if (SF_CTX->set_body_length(task) != 0) {
+        return -1;
+    }
+    if (task->length < 0) {
+        logError("file: "__FILE__", line: %d, "
+                "client ip: %s, pkg length: %d < 0",
+                __LINE__, task->client_ip,
+                task->length);
+        return -1;
+    }
+
+    task->length += SF_CTX->header_size;
+    if (task->length > g_sf_global_vars.max_pkg_size) {
+        logError("file: "__FILE__", line: %d, "
+                "client ip: %s, pkg length: %d > "
+                "max pkg size: %d", __LINE__,
+                task->client_ip, task->length,
+                g_sf_global_vars.max_pkg_size);
+        return -1;
+    }
+
+    return 0;
+}
+
 int sf_socket_async_connect_server(struct fast_task_info *task);
 int sf_socket_connect_server_done(struct fast_task_info *task);
 
diff --git a/src/sf_types.h b/src/sf_types.h
index 1fd0159..a88b317 100644
--- a/src/sf_types.h
+++ b/src/sf_types.h
@@ -60,6 +60,9 @@ typedef enum {
 } SFCommAction;
 
 struct sf_listener;
+
+typedef int (*sf_get_connection_size_callback)();
+typedef int (*sf_init_connection_callback)(struct fast_task_info *task, void *arg);
 typedef int (*sf_create_server_callback)(struct sf_listener
         *listener, int af, const char *bind_addr);
 typedef void (*sf_close_server_callback)(struct sf_listener *listener);
@@ -99,6 +102,8 @@ typedef struct sf_network_handler {
     SFListener outer;
 
     /* for server side */
+    sf_get_connection_size_callback get_connection_size;
+    sf_init_connection_callback init_connection;
     sf_create_server_callback create_server;
     sf_close_server_callback close_server;
     sf_accept_connection_callback accept_connection;