diff --git a/core/maingate.go b/core/maingate.go
index 1e318f9..1e4411c 100644
--- a/core/maingate.go
+++ b/core/maingate.go
@@ -12,7 +12,6 @@ import (
 	"net"
 	"net/http"
 	"os"
-	"runtime/debug"
 	"strings"
 	"sync/atomic"
 	"time"
@@ -244,57 +243,53 @@ func (mg *Maingate) discoverOpenIdConfiguration(name string, url string) error {
 
 }
 
-func makeErrorWithStack(err error) error {
-	return fmt.Errorf("%s\n%s", err.Error(), string(debug.Stack()))
-}
-
 func (mg *Maingate) prepare(context context.Context) (err error) {
 	if err := mg.discoverOpenIdConfiguration(AuthPlatformMicrosoft, "https://login.microsoftonline.com/common/v2.0/.well-known/openid-configuration"); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 	if err := mg.discoverOpenIdConfiguration("google", "https://accounts.google.com/.well-known/openid-configuration"); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 
 	// redis에서 env를 가져온 후에
 	mg.mongoClient, err = gocommon.NewMongoClient(context, mg.Mongo)
 	if err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionCouponUse, map[string]bson.D{
 		"idrounds": {{Key: "_id", Value: 1}, {Key: "rounds", Value: 1}},
 	}); err != nil {
-		return err
+		return logger.ErrorWithCallStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionLink, map[string]bson.D{
 		"platformuid": {{Key: "platform", Value: 1}, {Key: "uid", Value: 1}},
 	}); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionLink, map[string]bson.D{
 		"emailplatform": {{Key: "email", Value: 1}, {Key: "platform", Value: 1}},
 	}); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 
 	if err = mg.mongoClient.MakeIndices(CollectionAccount, map[string]bson.D{
 		"accid": {{Key: "accid", Value: 1}},
 	}); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionFile, map[string]bson.D{
 		"keyonly": {{Key: "key", Value: 1}},
 	}); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 
 	// Delete대신 _ts로 expire시킴. pipeline에 삭제 알려주기 위함
 	if err = mg.mongoClient.MakeExpireIndex(CollectionWhitelist, 10); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 
 	if *devflag {
@@ -303,40 +298,40 @@ func (mg *Maingate) prepare(context context.Context) (err error) {
 	}
 
 	if err = mg.mongoClient.MakeExpireIndex(CollectionBlock, int32(3)); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionPlatformLoginToken, map[string]bson.D{
 		"platformauthtoken": {{Key: "platform", Value: 1}, {Key: "key", Value: 1}},
 	}); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 
 	if err = mg.mongoClient.MakeExpireIndex(CollectionPlatformLoginToken, int32(mg.SessionTTL+300)); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionUserToken, map[string]bson.D{
 		"platformusertoken": {{Key: "platform", Value: 1}, {Key: "userid", Value: 1}},
 	}); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionGamepotUserInfo, map[string]bson.D{
 		"gamepotuserid": {{Key: "gamepotuserid", Value: 1}},
 	}); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionFirebaseUserInfo, map[string]bson.D{
 		"firebaseuserid": {{Key: "firebaseuserid", Value: 1}},
 	}); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 
 	mg.sessionProvider, err = session.NewProviderWithConfig(context, mg.SessionConfig)
 	if err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 
 	var preall []struct {
@@ -346,7 +341,7 @@ func (mg *Maingate) prepare(context context.Context) (err error) {
 	if err = mg.mongoClient.FindAllAs(CollectionFile, nil, &preall, options.Find().SetProjection(bson.M{
 		"link": 1,
 	})); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 
 	for _, pre := range preall {
@@ -361,23 +356,23 @@ func (mg *Maingate) prepare(context context.Context) (err error) {
 			"_id": pre.Id,
 		}, &fulldoc)
 		if err != nil {
-			return makeErrorWithStack(err)
+			return logger.ErrorWithCallStack(err)
 		}
 		err = fulldoc.Save()
 		if err != nil {
-			return makeErrorWithStack(err)
+			return logger.ErrorWithCallStack(err)
 		}
 	}
 
 	var whites []*whitelistmember
 	if err := mg.mongoClient.AllAs(CollectionWhitelist, &whites, options.Find().SetReturnKey(false)); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 	mg.wl.init(whites)
 
 	var blocks []*blockinfo
 	if err := mg.mongoClient.AllAs(CollectionBlock, &blocks); err != nil {
-		return makeErrorWithStack(err)
+		return logger.ErrorWithCallStack(err)
 	}
 	mg.bl.init(blocks)
 
@@ -390,7 +385,7 @@ func (mg *Maingate) prepare(context context.Context) (err error) {
 func (mg *Maingate) RegisterHandlers(ctx context.Context, serveMux *http.ServeMux, prefix string) error {
 	var allServices []*serviceDescription
 	if err := mg.mongoClient.AllAs(CollectionService, &allServices, options.Find().SetReturnKey(false)); err != nil {
-		return err
+		return logger.ErrorWithCallStack(err)
 	}
 
 	if len(allServices) > 0 {
@@ -409,7 +404,7 @@ func (mg *Maingate) RegisterHandlers(ctx context.Context, serveMux *http.ServeMu
 			host, _ := os.Hostname()
 			addrs, err := net.InterfaceAddrs()
 			if err != nil {
-				return err
+				return logger.ErrorWithCallStack(err)
 			}
 			ipaddr := "127.0.0.1"
 			for _, addr := range addrs {
@@ -441,7 +436,7 @@ func (mg *Maingate) RegisterHandlers(ctx context.Context, serveMux *http.ServeMu
 		}, options.Update().SetUpsert(true))
 
 		if err != nil {
-			return err
+			return logger.ErrorWithCallStack(err)
 		}
 	}
 
@@ -454,7 +449,7 @@ func (mg *Maingate) RegisterHandlers(ctx context.Context, serveMux *http.ServeMu
 	configraw, _ := json.Marshal(mg.maingateConfig)
 	var convertedConfig map[string]any
 	if err := json.Unmarshal(configraw, &convertedConfig); err != nil {
-		return err
+		return logger.ErrorWithCallStack(err)
 	}
 
 	serveMux.HandleFunc(gocommon.MakeHttpHandlerPattern(prefix, "config"), func(w http.ResponseWriter, r *http.Request) {
@@ -487,7 +482,7 @@ func (mg *Maingate) RegisterHandlers(ctx context.Context, serveMux *http.ServeMu
 
 	if err := os.MkdirAll("static", os.ModePerm); err != nil {
 		// 일반 엔드유저한테 오픈할 static 페이지
-		return err
+		return logger.ErrorWithCallStack(err)
 	}
 
 	cfsx := http.FileServer(http.Dir("console"))
@@ -548,7 +543,7 @@ func (mg *Maingate) GetUserBrowserInfo(r *http.Request) (string, error) {
 
 	cookie, err := r.Cookie("ActionSquareSessionExtraInfo")
 	if err != nil {
-		return "", err
+		return "", logger.ErrorWithCallStack(err)
 	}
 
 	//requestinfo := fmt.Sprintf("%s_%s", cookie.Value, host) //-- RemoteAddr체크는 로드밸런서 IP 찍히는 문제 때문에 제외한다.
@@ -570,7 +565,7 @@ func (mg *Maingate) setUserToken(info usertokeninfo) error {
 			"accesstoken_expire_time": info.accesstoken_expire_time,
 		},
 	}, options.Update().SetUpsert(true))
-	return err
+	return logger.ErrorWithCallStack(err)
 }
 
 func (mg *Maingate) getUserTokenWithCheck(platform string, userid string, brinfo string) (usertokeninfo, error) {
diff --git a/core/service.go b/core/service.go
index 9e3007b..2c24f88 100644
--- a/core/service.go
+++ b/core/service.go
@@ -565,12 +565,12 @@ func (sh *serviceDescription) authorize(w http.ResponseWriter, r *http.Request)
 
 		// !success일 때 빈 body를 보내면 클라이언트는 로그아웃 된다.
 		if success {
-			output := map[string]any{
+			json.NewEncoder(w).Encode(map[string]any{
 				"sk":       sk,
 				"expirein": sh.sessionTTL.Seconds(),
-			}
-			bt, _ := json.Marshal(output)
-			w.Write(bt)
+			})
+		} else {
+			logger.Println("sh.sessionProvider.Touch failed :", sk)
 		}
 		return
 	}
@@ -598,6 +598,7 @@ func (sh *serviceDescription) authorize(w http.ResponseWriter, r *http.Request)
 			if err != nil {
 				logger.Error("getProviderInfo failed :", err)
 				w.WriteHeader(http.StatusBadRequest)
+				return
 			}
 
 			if authtype != newType || uid != newId {
@@ -682,8 +683,8 @@ func (sh *serviceDescription) authorize(w http.ResponseWriter, r *http.Request)
 	if *noauth {
 		output["noauth"] = true
 	}
-	bt, _ := json.Marshal(output)
-	w.Write(bt)
+
+	json.NewEncoder(w).Encode(output)
 }
 
 func (sh *serviceDescription) findVersionSplit(version string) []byte {