diff --git a/protocol/json/server.go b/protocol/json/server.go
index e7e165d..dde8981 100644
--- a/protocol/json/server.go
+++ b/protocol/json/server.go
@@ -3,6 +3,7 @@ package json
 import (
 	"encoding/json"
 	"io"
+	"log"
 
 	"git.loafle.net/commons_go/rpc/encode"
 	"git.loafle.net/commons_go/rpc/protocol"
@@ -84,6 +85,7 @@ func newCodecRequest(r io.Reader, encoder encode.Encoder) protocol.CodecRequest
 	// Decode the request body and check if RPC method is valid.
 	req := new(serverRequest)
 	err := json.NewDecoder(r).Decode(req)
+	log.Printf("NewRequest err: %v", err)
 	if err != nil {
 		err = &Error{
 			Code:    E_PARSE,
diff --git a/registry.go b/registry.go
index dac9464..555df63 100644
--- a/registry.go
+++ b/registry.go
@@ -103,7 +103,7 @@ func (rr *rpcRegistry) Invoke(contentType string, r io.Reader, w io.Writer, befo
 	// Create a new codec request.
 	codecReq := codec.NewRequest(r)
 	// Get service method to be called.
-	log.Print("codecReq.Method")
+	log.Printf("codecReq.Method: %v", codecReq)
 	method, errMethod := codecReq.Method()
 	if errMethod != nil {
 		return write(codecReq, w, beforeWrite, afterWrite, nil, errMethod)