diff --git a/grpcmux/component.go b/grpcmux/component.go
index 26e151d..4ba3078 100644
--- a/grpcmux/component.go
+++ b/grpcmux/component.go
@@ -10,6 +10,10 @@ func initComponents(conf *config.Config) {
 }
 
 func initLogging(conf *config.Config) {
+	if conf == nil {
+		return
+	}
+
 	level := conf.GetString("level", "debug")
 	encoding := conf.GetString("encoding", "console")
 	outputPath := conf.GetString("output", "")
diff --git a/sample/grpc-server/go.mod b/sample/grpc-server/go.mod
index 9c6e4b3..ecc2791 100644
--- a/sample/grpc-server/go.mod
+++ b/sample/grpc-server/go.mod
@@ -3,6 +3,6 @@ module github.com/skema-dev/skema-go/sample/grpc-server
 go 1.16
 
 require (
-	github.com/skema-dev/skema-go v0.0.0-20220427180038-06103d6faceb
+	github.com/skema-dev/skema-go v1.0.0
 	google.golang.org/grpc v1.45.0
 )
diff --git a/sample/grpc-server/go.sum b/sample/grpc-server/go.sum
index 162d8f0..ab30592 100644
--- a/sample/grpc-server/go.sum
+++ b/sample/grpc-server/go.sum
@@ -447,8 +447,8 @@ github.com/shopspring/decimal v1.2.0/go.mod h1:DKyhrW/HYNuLGql+MJL6WCR6knT2jwCFR
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/sirupsen/logrus v1.4.1/go.mod h1:ni0Sbl8bgC9z8RoU9G6nDWqqs/fq4eDPysMBDgk/93Q=
 github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
-github.com/skema-dev/skema-go v0.0.0-20220427180038-06103d6faceb h1:9sBFkRmMb19ZcWLghi4OeWzW0wc8vxwKHDvZrbv745g=
-github.com/skema-dev/skema-go v0.0.0-20220427180038-06103d6faceb/go.mod h1:396A6TkYm98kH458fZwg+HnmPRxNNqrQrWJ2VgbaAN8=
+github.com/skema-dev/skema-go v1.0.0 h1:n9uCZcy3BEpJJnpfrQAZ+k040JMRrDoLhFMMeG7c4yk=
+github.com/skema-dev/skema-go v1.0.0/go.mod h1:SGdqe02Bdd3MzvbhnDBiFlJ16pXuDIoqcHHjzi2Cmno=
 github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
 github.com/spf13/afero v1.8.2 h1:xehSyVa0YnHWsJ49JFljMpg1HX19V6NDZ1fkm1Xznbo=
 github.com/spf13/afero v1.8.2/go.mod h1:CtAatgMJh6bJEIs48Ay/FOnkljP3WeGUG0MC1RfAqwo=
@@ -474,7 +474,6 @@ github.com/stretchr/testify v1.7.1 h1:5TQK59W5E3v0r2duFAb7P95B6hEeOyEnHRa8MjYSMT
 github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/subosito/gotenv v1.2.0 h1:Slr1R9HxAlEKefgq5jn9U+DnETlIUa6HfgEzj0g5d7s=
 github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
-github.com/traefik/yaegi v0.11.3/go.mod h1:RuCwD8/wsX7b6KoQHOaIFUfuH3gQIK4KWnFFmJMw5VA=
 github.com/tv42/httpunix v0.0.0-20150427012821-b75d8614f926/go.mod h1:9ESjWnEqriFuLhtthL60Sar/7RFoluCcXsuvEwTV5KM=
 github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
diff --git a/sample/grpc-server/grpc.yaml b/sample/grpc-server/grpc.yml
similarity index 100%
rename from sample/grpc-server/grpc.yaml
rename to sample/grpc-server/grpc.yml
diff --git a/test/grpcmux_config/conf/grpc_test.yaml b/test/grpcmux_config/conf/grpc_test.yaml
new file mode 100644
index 0000000..70cf594
--- /dev/null
+++ b/test/grpcmux_config/conf/grpc_test.yaml
@@ -0,0 +1,6 @@
+port: 9991     # for grpc service
+http:
+  port: 9992   # for http service
+  gateway:
+    path: "/"  # this is the routing prefix if you need. You can force to append an extra path before all standard URLs
+
diff --git a/test/grpcmux_config/grpcmux_config.go b/test/grpcmux_config/grpcmux_config.go
new file mode 100644
index 0000000..f34a472
--- /dev/null
+++ b/test/grpcmux_config/grpcmux_config.go
@@ -0,0 +1,62 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	_ "embed"
+
+	"github.com/skema-dev/skema-go/grpcmux"
+	"github.com/skema-dev/skema-go/logging"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/metadata"
+)
+
+func main() {
+	grpcSrv := grpcmux.NewServer(
+		grpc.ChainUnaryInterceptor(Interceptor1(), Interceptor2(), Interceptor3()),
+	)
+
+	if err := grpcSrv.Serve(); err != nil {
+		logging.Fatalf("Serve error %v", err.Error())
+	}
+}
+
+func Interceptor1() grpc.UnaryServerInterceptor {
+	return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo,
+		handler grpc.UnaryHandler) (resp interface{}, err error) {
+		_, ok := metadata.FromIncomingContext(ctx)
+		if !ok {
+			return nil, fmt.Errorf("couldn't parse incoming context metadata")
+		}
+		logging.Infof("first interceptoer 11111")
+		h, err := handler(ctx, req)
+		return h, err
+	}
+}
+
+func Interceptor2() grpc.UnaryServerInterceptor {
+	return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo,
+		handler grpc.UnaryHandler) (resp interface{}, err error) {
+		_, ok := metadata.FromIncomingContext(ctx)
+		if !ok {
+			return nil, fmt.Errorf("couldn't parse incoming context metadata")
+		}
+		logging.Infof(" interceptoer 222222")
+		h, err := handler(ctx, req)
+		return h, err
+	}
+}
+
+func Interceptor3() grpc.UnaryServerInterceptor {
+	return func(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo,
+		handler grpc.UnaryHandler) (resp interface{}, err error) {
+		_, ok := metadata.FromIncomingContext(ctx)
+		if !ok {
+			return nil, fmt.Errorf("couldn't parse incoming context metadata")
+		}
+		logging.Infof(" interceptoer 333333")
+		h, err := handler(ctx, req)
+		return h, err
+	}
+}