diff --git a/logger/logger.go b/logger/logger.go
index 1e2b959..7aa2b31 100644
--- a/logger/logger.go
+++ b/logger/logger.go
@@ -7,6 +7,7 @@ import (
 	"log"
 	"os"
 	"path"
+	"runtime"
 	"runtime/debug"
 	"strings"
 )
@@ -101,3 +102,44 @@ func Panicln(v ...interface{}) {
 	errlogger.Output(2, string(debug.Stack()))
 	panic(s)
 }
+
+type errWithCallstack struct {
+	inner  error
+	frames []*runtime.Frame
+}
+
+func (ecs *errWithCallstack) Error() string {
+	if ecs.frames == nil {
+		return ecs.inner.Error()
+	}
+
+	out := make([]string, 0, len(ecs.frames)+1)
+	out = append(out, ecs.inner.Error())
+	for i := len(ecs.frames) - 1; i >= 0; i-- {
+		frame := ecs.frames[i]
+		out = append(out, fmt.Sprintf("%s\n\t%s:%d", frame.Function, frame.File, frame.Line))
+	}
+
+	return strings.Join(out, "\n")
+}
+
+func ErrorWithCallStack(err error) error {
+	var frames []*runtime.Frame
+
+	if recur, ok := err.(*errWithCallstack); ok {
+		err = recur.inner
+		frames = recur.frames
+	}
+
+	pc, _, _, ok := runtime.Caller(1)
+	if ok {
+		curframes := runtime.CallersFrames([]uintptr{pc})
+		f, _ := curframes.Next()
+		frames = append(frames, &f)
+	}
+
+	return &errWithCallstack{
+		inner:  err,
+		frames: frames,
+	}
+}
diff --git a/server.go b/server.go
index 3762acb..2bfdcb4 100644
--- a/server.go
+++ b/server.go
@@ -1,6 +1,7 @@
 package gocommon
 
 import (
+	"bytes"
 	"context"
 	"encoding/gob"
 	"encoding/json"
@@ -699,22 +700,68 @@ func MakeHttpApiHandler[T any](receiver *T, receiverName string) HttpApiHandler
 	}
 }
 
-type HttpApiHandlerContainer struct {
-	methods map[string]apiFuncType
+type HttpApiBroker struct {
+	methods     map[string]apiFuncType
+	methods_dup map[string][]apiFuncType
 }
 
-func (hc *HttpApiHandlerContainer) RegisterApiHandler(receiver HttpApiHandler) {
+type bufferReadCloser struct {
+	*bytes.Reader
+}
+
+func (buff *bufferReadCloser) Close() error { return nil }
+
+type readOnlyResponseWriter struct {
+	inner      http.ResponseWriter
+	statusCode int
+}
+
+func (w *readOnlyResponseWriter) Header() http.Header {
+	return w.inner.Header()
+}
+
+func (w *readOnlyResponseWriter) Write(in []byte) (int, error) {
+	logger.Println("readOnlyResponseWriter cannot write")
+	return len(in), nil
+}
+
+func (w *readOnlyResponseWriter) WriteHeader(statusCode int) {
+	w.statusCode = statusCode
+}
+
+func (hc *HttpApiBroker) AddHandler(receiver HttpApiHandler) {
 	if hc.methods == nil {
 		hc.methods = make(map[string]apiFuncType)
+		hc.methods_dup = make(map[string][]apiFuncType)
 	}
 
 	for k, v := range receiver.methods {
 		logger.Println("http api registered :", k)
-		hc.methods[k] = v
+
+		hc.methods_dup[k] = append(hc.methods_dup[k], v)
+		if len(hc.methods_dup[k]) > 1 {
+			chain := hc.methods_dup[k]
+			hc.methods[k] = func(w http.ResponseWriter, r *http.Request) {
+				body, _ := io.ReadAll(r.Body)
+				defer r.Body.Close()
+
+				wrap := &readOnlyResponseWriter{inner: w, statusCode: 200}
+				for _, f := range chain {
+					r.Body = &bufferReadCloser{bytes.NewReader(body)}
+					f(wrap, r)
+				}
+
+				if wrap.statusCode != 200 {
+					w.WriteHeader(wrap.statusCode)
+				}
+			}
+		} else {
+			hc.methods[k] = v
+		}
 	}
 }
 
-func (hc *HttpApiHandlerContainer) Call(funcname string, w http.ResponseWriter, r *http.Request) {
+func (hc *HttpApiBroker) Call(funcname string, w http.ResponseWriter, r *http.Request) {
 	if found := hc.methods[funcname]; found != nil {
 		found(w, r)
 	} else {
diff --git a/session/impl_redis.go b/session/impl_redis.go
index fa5a775..1097bdf 100644
--- a/session/impl_redis.go
+++ b/session/impl_redis.go
@@ -53,18 +53,23 @@ func (p *provider_redis) New(input *Authorization) (string, error) {
 	if err != nil {
 		return "", err
 	}
+	pk := storagekey_to_publickey(sk)
 
-	return string(storagekey_to_publickey(sk)), err
+	logger.Println("session provider new :", sk, pk)
+
+	return string(pk), err
 }
 
 func (p *provider_redis) Delete(account primitive.ObjectID) error {
 	prefix := account.Hex()
 	sks, err := p.redisClient.Keys(p.ctx, prefix+"*").Result()
 	if err != nil {
+		logger.Println("session provider delete :", sks, err)
 		return err
 	}
 
 	for _, sk := range sks {
+		logger.Println("session provider delete :", sk)
 		p.redisClient.Del(p.ctx, sk).Result()
 		p.redisClient.Publish(p.ctx, p.deleteChannel, sk).Result()
 	}
@@ -76,29 +81,38 @@ func (p *provider_redis) Query(pk string) (Authorization, error) {
 	sk := publickey_to_storagekey(publickey(pk))
 	payload, err := p.redisClient.Get(p.ctx, string(sk)).Result()
 	if err == redis.Nil {
+		logger.Println("session provider query :", pk, err)
 		return Authorization{}, nil
 	} else if err != nil {
+		logger.Println("session provider query :", pk, err)
 		return Authorization{}, err
 	}
 
 	var auth Authorization
 	if err := json.Unmarshal([]byte(payload), &auth); err != nil {
+		logger.Println("session provider query :", pk, err)
 		return Authorization{}, err
 	}
 
+	logger.Println("session provider query :", pk, auth)
+
 	return auth, nil
 }
 
 func (p *provider_redis) Touch(pk string) (bool, error) {
 	sk := publickey_to_storagekey(publickey(pk))
 	ok, err := p.redisClient.Expire(p.ctx, string(sk), p.ttl).Result()
+	logger.Println("session provider touch :", pk)
+
 	if err == redis.Nil {
 		// 이미 만료됨
+		logger.Println("session consumer touch :", pk, err)
 		return false, nil
 	} else if err != nil {
-		logger.Println("consumer Touch :", err)
+		logger.Println("session consumer touch :", pk, err)
 		return false, err
 	}
+	logger.Println("session consumer touch :", pk)
 
 	return ok, nil
 }
@@ -223,16 +237,20 @@ func (c *consumer_redis) Query(pk string) (Authorization, error) {
 	sk := publickey_to_storagekey(publickey(pk))
 	si, _, err := c.query_internal(sk)
 	if err != nil {
+		logger.Println("session consumer query :", pk, err)
 		return Authorization{}, err
 	}
 
 	if si == nil {
+		logger.Println("session consumer query(si nil) :", pk, nil)
 		return Authorization{}, nil
 	}
 
 	if time.Now().After(si.expireAt) {
+		logger.Println("session consumer query(expired):", pk, nil)
 		return Authorization{}, nil
 	}
+	logger.Println("session consumer query :", pk)
 
 	return *si.Authorization, nil
 }
@@ -244,9 +262,11 @@ func (c *consumer_redis) Touch(pk string) (Authorization, error) {
 	sk := publickey_to_storagekey(publickey(pk))
 	ok, err := c.redisClient.Expire(c.ctx, string(sk), c.ttl).Result()
 	if err == redis.Nil {
+		logger.Println("session consumer touch :", pk, err)
+
 		return Authorization{}, nil
 	} else if err != nil {
-		logger.Println("consumer Touch :", err)
+		logger.Println("session consumer touch :", pk, err)
 		return Authorization{}, err
 	}
 
@@ -254,10 +274,12 @@ func (c *consumer_redis) Touch(pk string) (Authorization, error) {
 		// redis에 살아있다.
 		si, added, err := c.query_internal(sk)
 		if err != nil {
+			logger.Println("session consumer touch(ok) :", pk, err)
 			return Authorization{}, err
 		}
 
 		if si == nil {
+			logger.Println("session consumer touch(ok, si nil) :", pk)
 			return Authorization{}, nil
 		}
 
@@ -267,8 +289,10 @@ func (c *consumer_redis) Touch(pk string) (Authorization, error) {
 			c.add_internal(sk, si)
 		}
 
+		logger.Println("session consumer touch(ok) :", pk)
 		return *si.Authorization, nil
 	}
 
+	logger.Println("session consumer touch(!ok) :", pk)
 	return Authorization{}, nil
 }
diff --git a/wshandler/api_handler.go b/wshandler/api_handler.go
index f977f4b..adeba0a 100644
--- a/wshandler/api_handler.go
+++ b/wshandler/api_handler.go
@@ -4,8 +4,10 @@ import (
 	"encoding/json"
 	"io"
 	"reflect"
+	"strings"
 	"unsafe"
 
+	"github.com/gorilla/websocket"
 	"repositories.action2quare.com/ayo/gocommon/logger"
 )
 
@@ -15,11 +17,13 @@ const (
 )
 
 type apiFuncType func(ApiCallContext)
+type connFuncType func(*websocket.Conn, *Sender)
 
 type WebsocketApiHandler struct {
-	methods     map[string]apiFuncType
-	connfunc    apiFuncType
-	disconnfunc apiFuncType
+	methods              map[string]apiFuncType
+	connfunc             connFuncType
+	disconnfunc          connFuncType
+	originalReceiverName string
 }
 
 type ApiCallContext struct {
@@ -35,92 +39,133 @@ func MakeWebsocketApiHandler[T any](receiver *T, receiverName string) WebsocketA
 		receiverName = tp.Elem().Name()
 	}
 
-	var connfunc apiFuncType
-	var disconnfunc apiFuncType
+	var connfunc connFuncType
+	var disconnfunc connFuncType
 
 	for i := 0; i < tp.NumMethod(); i++ {
 		method := tp.Method(i)
-		if method.Type.NumIn() != 2 {
-			continue
-		}
-
 		if method.Type.In(0) != tp {
 			continue
 		}
 
-		if method.Type.In(1) != reflect.TypeOf((*ApiCallContext)(nil)).Elem() {
-			continue
-		}
-
-		funcptr := method.Func.Pointer()
-		p1 := unsafe.Pointer(&funcptr)
-		p2 := unsafe.Pointer(&p1)
-		testfunc := (*func(*T, ApiCallContext))(p2)
-
 		if method.Name == ClientConnected {
-			connfunc = func(ctx ApiCallContext) {
-				(*testfunc)(receiver, ctx)
+			if method.Type.NumIn() != 3 {
+				continue
+			}
+			if method.Type.In(1) != reflect.TypeOf((*websocket.Conn)(nil)) {
+				continue
+			}
+			if method.Type.In(2) != reflect.TypeOf((*Sender)(nil)) {
+				continue
+			}
+			funcptr := method.Func.Pointer()
+			p1 := unsafe.Pointer(&funcptr)
+			p2 := unsafe.Pointer(&p1)
+			connfuncptr := (*func(*T, *websocket.Conn, *Sender))(p2)
+
+			connfunc = func(c *websocket.Conn, s *Sender) {
+				(*connfuncptr)(receiver, c, s)
 			}
 		} else if method.Name == ClientDisconnected {
-			disconnfunc = func(ctx ApiCallContext) {
-				(*testfunc)(receiver, ctx)
+			if method.Type.NumIn() != 3 {
+				continue
+			}
+			if method.Type.In(1) != reflect.TypeOf((*websocket.Conn)(nil)) {
+				continue
+			}
+			if method.Type.In(2) != reflect.TypeOf((*Sender)(nil)) {
+				continue
+			}
+			funcptr := method.Func.Pointer()
+			p1 := unsafe.Pointer(&funcptr)
+			p2 := unsafe.Pointer(&p1)
+			disconnfuncptr := (*func(*T, *websocket.Conn, *Sender))(p2)
+
+			disconnfunc = func(c *websocket.Conn, s *Sender) {
+				(*disconnfuncptr)(receiver, c, s)
 			}
 		} else {
+			if method.Type.NumIn() != 2 {
+				continue
+			}
+			if method.Type.In(1) != reflect.TypeOf((*ApiCallContext)(nil)).Elem() {
+				continue
+			}
+
+			funcptr := method.Func.Pointer()
+			p1 := unsafe.Pointer(&funcptr)
+			p2 := unsafe.Pointer(&p1)
+			apifuncptr := (*func(*T, ApiCallContext))(p2)
 			methods[receiverName+"."+method.Name] = func(ctx ApiCallContext) {
-				(*testfunc)(receiver, ctx)
+				(*apifuncptr)(receiver, ctx)
 			}
 		}
 	}
 
 	return WebsocketApiHandler{
-		methods:     methods,
-		connfunc:    connfunc,
-		disconnfunc: disconnfunc,
+		methods:              methods,
+		connfunc:             connfunc,
+		disconnfunc:          disconnfunc,
+		originalReceiverName: tp.Elem().Name(),
 	}
 }
 
 type WebsocketApiBroker struct {
 	methods      map[string]apiFuncType
-	connFuncs    []apiFuncType
-	disconnFuncs []apiFuncType
+	methods_dup  map[string][]apiFuncType
+	connFuncs    []connFuncType
+	disconnFuncs []connFuncType
 }
 
 func (hc *WebsocketApiBroker) AddHandler(receiver WebsocketApiHandler) {
 	if hc.methods == nil {
 		hc.methods = make(map[string]apiFuncType)
+		hc.methods_dup = make(map[string][]apiFuncType)
 	}
 
 	for k, v := range receiver.methods {
-		logger.Println("http api registered :", k)
-		hc.methods[k] = v
+		ab := strings.Split(k, ".")
+		logger.Printf("websocket api registered : %s.%s -> %s\n", receiver.originalReceiverName, ab[1], k)
+
+		hc.methods_dup[k] = append(hc.methods_dup[k], v)
+		if len(hc.methods_dup[k]) > 1 {
+			chain := hc.methods_dup[k]
+			hc.methods[k] = func(ctx ApiCallContext) {
+				for _, f := range chain {
+					f(ctx)
+				}
+			}
+		} else {
+			hc.methods[k] = v
+		}
 	}
 
 	if receiver.connfunc != nil {
+		logger.Printf("websocket api registered : %s.ClientConnected\n", receiver.originalReceiverName)
 		hc.connFuncs = append(hc.connFuncs, receiver.connfunc)
 	}
 
 	if receiver.disconnfunc != nil {
 		// disconnfunc은 역순
-		hc.disconnFuncs = append([]apiFuncType{receiver.disconnfunc}, hc.disconnFuncs...)
+		logger.Printf("websocket api registered : %s.ClientDisconnected\n", receiver.originalReceiverName)
+		hc.disconnFuncs = append([]connFuncType{receiver.disconnfunc}, hc.disconnFuncs...)
+	}
+}
+
+func (hc *WebsocketApiBroker) ClientConnected(c *wsconn) {
+	for _, v := range hc.connFuncs {
+		v(c.Conn, c.sender)
+	}
+}
+
+func (hc *WebsocketApiBroker) ClientDisconnected(c *wsconn) {
+	for _, v := range hc.disconnFuncs {
+		v(c.Conn, c.sender)
 	}
 }
 
 func (hc *WebsocketApiBroker) Call(callby *Sender, funcname string, r io.Reader) {
-	if funcname == ClientConnected {
-		for _, v := range hc.connFuncs {
-			v(ApiCallContext{
-				CallBy:    callby,
-				Arguments: nil,
-			})
-		}
-	} else if funcname == ClientDisconnected {
-		for _, v := range hc.disconnFuncs {
-			v(ApiCallContext{
-				CallBy:    callby,
-				Arguments: nil,
-			})
-		}
-	} else if found := hc.methods[funcname]; found != nil {
+	if found := hc.methods[funcname]; found != nil {
 		var args []any
 		if r != nil {
 			dec := json.NewDecoder(r)
diff --git a/wshandler/wshandler.go b/wshandler/wshandler.go
index f4e4755..4eeafce 100644
--- a/wshandler/wshandler.go
+++ b/wshandler/wshandler.go
@@ -85,6 +85,8 @@ type send_msg_queue_elem struct {
 }
 
 type WebsocketHandler struct {
+	WebsocketApiBroker
+
 	redisMsgChanName  string
 	redisCmdChanName  string
 	redisSync         *redis.Client
@@ -93,7 +95,6 @@ type WebsocketHandler struct {
 	localDeliveryChan chan any
 	sendMsgChan       chan send_msg_queue_elem
 
-	wsApiBroker     WebsocketApiBroker
 	connWaitGroup   sync.WaitGroup
 	sessionConsumer session.Consumer
 }
@@ -121,7 +122,7 @@ func NewWebsocketHandler(consumer session.Consumer, redisUrl string) (*Websocket
 
 	redisSync, err := gocommon.NewRedisClient(redisUrl)
 	if err != nil {
-		return nil, err
+		return nil, logger.ErrorWithCallStack(err)
 	}
 
 	sendchan := make(chan send_msg_queue_elem, 1000)
@@ -153,10 +154,6 @@ func NewWebsocketHandler(consumer session.Consumer, redisUrl string) (*Websocket
 	}, nil
 }
 
-func (ws *WebsocketHandler) RegisterApiHandler(handler WebsocketApiHandler) {
-	ws.wsApiBroker.AddHandler(handler)
-}
-
 func (ws *WebsocketHandler) Start(ctx context.Context) {
 	ws.connWaitGroup.Add(1)
 	go ws.mainLoop(ctx)
@@ -260,7 +257,7 @@ func (ws *WebsocketHandler) mainLoop(ctx context.Context) {
 
 	defer func() {
 		for _, conn := range entireConns {
-			ws.wsApiBroker.Call(conn.sender, ClientDisconnected, nil)
+			ws.Call(conn.sender, ClientDisconnected, nil)
 			conn.Close()
 		}
 	}()
@@ -414,10 +411,12 @@ func (ws *WebsocketHandler) mainLoop(ctx context.Context) {
 		case c := <-ws.connInOutChan:
 			if c.Conn == nil {
 				delete(entireConns, c.sender.Accid.Hex())
-				go ws.wsApiBroker.Call(c.sender, ClientDisconnected, nil)
+				logger.Println("ClientDisconnected :", c.sender.Alias)
+				go ws.ClientDisconnected(c)
 			} else {
 				entireConns[c.sender.Accid.Hex()] = c
-				go ws.wsApiBroker.Call(c.sender, ClientConnected, nil)
+				logger.Println("ClientConnected :", c.sender.Alias)
+				go ws.ClientConnected(c)
 			}
 		}
 	}
@@ -451,7 +450,7 @@ func upgrade_core(ws *WebsocketHandler, conn *websocket.Conn, accid primitive.Ob
 				r.Read(size[:])
 				cmd := make([]byte, size[0])
 				r.Read(cmd)
-				ws.wsApiBroker.Call(newconn.sender, string(cmd), r)
+				ws.Call(newconn.sender, string(cmd), r)
 			}
 		}
 		ws.connWaitGroup.Done()