diff --git a/skills/rpc/README.md b/skills/rpc/README.md
index 0129e11..472af02 100644
--- a/skills/rpc/README.md
+++ b/skills/rpc/README.md
@@ -1,5 +1,7 @@
 # RPC
 
+[课件](https://gitee.com/infraboard/go-course/blob/master/day15/rpc.md#json-on-http)
+
 + Go语言内置RPC框架的使用(原始)
 + 基于接口封装优化好的RPC
 + Protobuf介绍与环境准备
@@ -33,5 +35,6 @@ Protobuf的包机制以及使用方式
 
 RPC是远程过程调用的简称，是分布式系统中不同节点间流行的通信方式。在互联网时代，RPC已经和IPC一样成为一个不可或缺的基础构件。
 
-## GO语言内置RPC
-
+```sh
+echo -e '{"method":"HelloService.Hello","params":[{"my_name":"bob"}],"id":1}' | nc localhost 1234
+```
diff --git a/skills/rpc/hello_world/server/main.go b/skills/rpc/hello_world/server/main.go
index fd80893..1909ec9 100644
--- a/skills/rpc/hello_world/server/main.go
+++ b/skills/rpc/hello_world/server/main.go
@@ -3,6 +3,7 @@ package main
 import (
 	"net"
 	"net/rpc"
+	"net/rpc/jsonrpc"
 
 	"gitlab.com/go-course-project/go17/skills/rpc/hello_world/service"
 )
@@ -45,6 +46,10 @@ func main() {
 			continue
 		}
 		// 用户的net层数据 转交给 rpc框架
-		go rpc.ServeConn(conn)
+		// go rpc.ServeConn(conn)
+		// json codec(server)
+		// req(bytes) -->  obj
+		// resp(obj) --> bytes
+		go rpc.ServeCodec(jsonrpc.NewServerCodec(conn))
 	}
 }
diff --git a/skills/rpc/hello_world/service/client.go b/skills/rpc/hello_world/service/client.go
index 76bd194..5058665 100644
--- a/skills/rpc/hello_world/service/client.go
+++ b/skills/rpc/hello_world/service/client.go
@@ -1,15 +1,21 @@
 package service
 
 import (
+	"log"
+	"net"
 	"net/rpc"
+	"net/rpc/jsonrpc"
 )
 
 func NewClient(address string) (HelloService, error) {
-	conn, err := rpc.Dial("tcp", address)
+	// 建立TCP连接
+	conn, err := net.Dial("tcp", "localhost:1234")
 	if err != nil {
-		return nil, err
+		log.Fatal("net.Dial:", err)
 	}
 
+	client := rpc.NewClientWithCodec(jsonrpc.NewClientCodec(conn))
+
 	// buf := bytes.NewBuffer([]byte{})
 	// gob.NewEncoder(buf).Encode(HelloRequest{Name: "test"})
 
@@ -17,7 +23,7 @@ func NewClient(address string) (HelloService, error) {
 	// reader := bytes.NewReader([]byte("{}"))
 	// resp := HelloRequest{Name: "test"}
 	// gob.NewDecoder(reader).Decode(&resp)
-	return &HelloServiceClient{conn: conn}, nil
+	return &HelloServiceClient{conn: client}, nil
 }
 
 // 要封装原始的 不友好的rpc call