diff --git a/server.go b/server.go
index d3f98f8..3762acb 100644
--- a/server.go
+++ b/server.go
@@ -430,17 +430,44 @@ func ReadStringFormValue(r url.Values, key string) (string, bool) {
 	return strval, len(strval) > 0
 }
 
-func DecodeGob[T any](r io.Reader, out *T) error {
-	dec := gob.NewDecoder(r)
-	return dec.Decode(out)
+type encoder interface {
+	Encode(any) error
 }
 
-func ReadJsonDocumentFromBody[T any](r io.Reader, out *T) error {
-	bt, err := io.ReadAll(r)
-	if err != nil {
-		return err
+type nilEncoder struct{}
+
+func (ne *nilEncoder) Encode(any) error { return nil }
+
+type decoder interface {
+	Decode(any) error
+}
+
+type nilDecoder struct{}
+
+func (nd *nilDecoder) Decode(any) error { return nil }
+
+func MakeDecoder(r *http.Request) decoder {
+	ct := r.Header.Get("Content-Type")
+	if ct == "application/gob" {
+		return gob.NewDecoder(r.Body)
+	} else if ct == "application/json" {
+		return json.NewDecoder(r.Body)
 	}
-	return json.Unmarshal(bt, out)
+
+	logger.Error("Content-Type is not supported :", ct)
+	return &nilDecoder{}
+}
+
+func MakeEncoder(w http.ResponseWriter, r *http.Request) encoder {
+	ct := r.Header.Get("Content-Type")
+	if ct == "application/gob" {
+		return gob.NewEncoder(w)
+	} else if ct == "application/json" {
+		return json.NewEncoder(w)
+	}
+
+	logger.Error("Content-Type is not supported :", ct)
+	return &nilEncoder{}
 }
 
 func DotStringToTimestamp(tv string) primitive.Timestamp {
diff --git a/wshandler/room.go b/wshandler/room.go
index c26bbf0..b807e42 100644
--- a/wshandler/room.go
+++ b/wshandler/room.go
@@ -6,12 +6,13 @@ import (
 	"encoding/json"
 
 	"github.com/gorilla/websocket"
+	"go.mongodb.org/mongo-driver/bson/primitive"
 	"repositories.action2quare.com/ayo/gocommon/logger"
 )
 
 type room struct {
 	inChan      chan *wsconn
-	outChan     chan *wsconn
+	outChan     chan primitive.ObjectID
 	messageChan chan *UpstreamMessage
 	name        string
 	destroyChan chan<- string
@@ -22,7 +23,7 @@ type room struct {
 func makeRoom(name string, destroyChan chan<- string, sendMsgChan chan<- send_msg_queue_elem) *room {
 	return &room{
 		inChan:      make(chan *wsconn, 10),
-		outChan:     make(chan *wsconn, 10),
+		outChan:     make(chan primitive.ObjectID, 10),
 		messageChan: make(chan *UpstreamMessage, 100),
 		name:        name,
 		destroyChan: destroyChan,
@@ -39,8 +40,8 @@ func (r *room) in(conn *wsconn) *room {
 	return r
 }
 
-func (r *room) out(conn *wsconn) *room {
-	r.outChan <- conn
+func (r *room) out(accid primitive.ObjectID) *room {
+	r.outChan <- accid
 	return r
 }
 
@@ -72,8 +73,8 @@ func (r *room) loop(ctx context.Context, conns *map[string]*wsconn) (normalEnd b
 		case conn := <-r.inChan:
 			(*conns)[conn.sender.Accid.Hex()] = conn
 
-		case conn := <-r.outChan:
-			delete((*conns), conn.sender.Accid.Hex())
+		case accid := <-r.outChan:
+			delete((*conns), accid.Hex())
 			if len(*conns) == 0 && r.destroyChan != nil {
 				r.destroyChan <- r.name
 				return true
diff --git a/wshandler/wshandler.go b/wshandler/wshandler.go
index 10ba250..f4e4755 100644
--- a/wshandler/wshandler.go
+++ b/wshandler/wshandler.go
@@ -130,7 +130,7 @@ func NewWebsocketHandler(consumer session.Consumer, redisUrl string) (*Websocket
 			defer func() {
 				r := recover()
 				if r != nil {
-					logger.Println(r)
+					logger.Println("send_msg_queue_elem sender recover :", r, string(elem.msg))
 				}
 			}()
 			elem.to.WriteMessage(elem.mt, elem.msg)
@@ -327,17 +327,11 @@ func (ws *WebsocketHandler) mainLoop(ctx context.Context) {
 			}
 			roomName := usermsg.Args[0].(string)
 			accid := usermsg.Args[1].(primitive.ObjectID)
-			conn := entireConns[accid.Hex()]
-			if conn == nil {
-				return false, nil
-			}
-
 			room := findRoom(roomName, false)
 			if room == nil {
 				return false, errProcessFailed_NotInRoom
 			}
-
-			room.out(conn)
+			room.out(accid)
 		}
 		return true, nil
 	}