diff --git a/README.md b/README.md
index 807fe0a..8630d9b 100644
--- a/README.md
+++ b/README.md
@@ -16,11 +16,11 @@ import (
 )
 
 func main() {
-	d := elton.New()
+	e := elton.New()
 
 	target, _ := url.Parse("https://www.baidu.com")
 
-	d.GET("/*url", proxy.New(proxy.Config{
+	e.GET("/*url", proxy.New(proxy.Config{
 		// proxy done will call this function
 		Done: func(c *elton.Context) {
 
@@ -34,6 +34,9 @@ func main() {
 		Host:   "www.baidu.com",
 	}))
 
-	d.ListenAndServe(":3000")
+	err := e.ListenAndServe(":3000")
+	if err != nil {
+		panic(err)
+	}
 }
 ```
\ No newline at end of file
diff --git a/example/main.go b/example/main.go
index 7445ed3..045ddb6 100644
--- a/example/main.go
+++ b/example/main.go
@@ -9,11 +9,11 @@ import (
 )
 
 func main() {
-	d := elton.New()
+	e := elton.New()
 
 	target, _ := url.Parse("https://www.baidu.com")
 
-	d.GET("/*url", proxy.New(proxy.Config{
+	e.GET("/*url", proxy.New(proxy.Config{
 		// proxy done will call this function
 		Done: func(c *elton.Context) {
 
@@ -27,7 +27,7 @@ func main() {
 		Host: "www.baidu.com",
 	}))
 
-	err := d.ListenAndServe(":3000")
+	err := e.ListenAndServe(":3000")
 	if err != nil {
 		panic(err)
 	}
diff --git a/go.mod b/go.mod
index ca45cd5..211d25f 100644
--- a/go.mod
+++ b/go.mod
@@ -4,7 +4,7 @@ go 1.12
 
 require (
 	github.com/stretchr/testify v1.4.0
-	github.com/vicanso/elton v0.2.2
+	github.com/vicanso/elton v0.2.3
 	github.com/vicanso/hes v0.2.1
 	gopkg.in/h2non/gock.v1 v1.0.15
 )
diff --git a/go.sum b/go.sum
index ddf6061..558b02e 100644
--- a/go.sum
+++ b/go.sum
@@ -7,13 +7,12 @@ github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8
 github.com/nbio/st v0.0.0-20140626010706-e9e8d9816f32/go.mod h1:9wM+0iRr9ahx58uYLpLIr5fm8diHn0JbqRycJi6w0Ms=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
-github.com/vicanso/elton v0.2.2 h1:MZ5nfJFKBWDWnFPO8wRyPat8kZz3KoNBY0scemo7RFQ=
-github.com/vicanso/elton v0.2.2/go.mod h1:QFZ+Un4LLBANtl0mExkqLD4uqw3JLA2ZCWUHaCsHOUg=
+github.com/vicanso/elton v0.2.3 h1:XQskGFtw/hhtNXRU7dLX0OFcpG64pK4PMXh9CVjHVbA=
+github.com/vicanso/elton v0.2.3/go.mod h1:QFZ+Un4LLBANtl0mExkqLD4uqw3JLA2ZCWUHaCsHOUg=
 github.com/vicanso/hes v0.2.1 h1:jRFEADmiQ30koVY/sKwlkhyXM5B3QbVVizLqrjNJgPw=
 github.com/vicanso/hes v0.2.1/go.mod h1:QcxOFmFfBQMhASTaLgnFayXYCgevdSeBVprt+o+3eKo=
 github.com/vicanso/intranet-ip v0.0.1 h1:cYS+mExFsKqewWSuHtFwAqw/CO66GsheB/P1BPmSTx0=