diff --git a/.travis.yml b/.travis.yml
index 3fb3d40..7a6ebf0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,9 @@ sudo: required
 
 go:
   - "1.12"
+  - "1.13"
   - "master"
 
 script:
-  - env GO111MODULE=on make test
\ No newline at end of file
+  - curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.21.0
+  - make lint && make test
\ No newline at end of file
diff --git a/Makefile b/Makefile
index b9cc0c8..166697b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,5 @@
+export GO111MODULE = on
+
 .PHONY: default test test-cover dev
 
 # for test
@@ -6,3 +8,6 @@ test:
 
 test-cover:
 	go test -race -coverprofile=test.out ./... && go tool cover --html=test.out
+
+lint:
+	golangci-lint run
diff --git a/README.md b/README.md
index 6ab2d85..a9d7d78 100644
--- a/README.md
+++ b/README.md
@@ -11,32 +11,34 @@ Router concurrent limiter for elton, it support custom max concurrency for each
 package main
 
 import (
+	"bytes"
 	"time"
 
 	"github.com/vicanso/elton"
 
-	responder "github.com/vicanso/elton-responder"
 	routerLimiter "github.com/vicanso/elton-router-concurrent-limiter"
 )
 
 func main() {
-	d := elton.New()
+	e := elton.New()
 
-	d.Use(routerLimiter.New(routerLimiter.Config{
+	e.Use(routerLimiter.New(routerLimiter.Config{
 		Limiter: routerLimiter.NewLocalLimiter(map[string]uint32{
 			"GET /users/me": 2,
 		}),
 	}))
-	d.Use(responder.NewDefault())
 
-	d.GET("/users/me", func(c *elton.Context) (err error) {
+	e.GET("/users/me", func(c *elton.Context) (err error) {
 		time.Sleep(time.Second)
-		c.Body = map[string]string{
+		c.BodyBuffer = bytes.NewBufferString(`{
 			"account": "tree",
-			"name":    "tree.xie",
-		}
+			"name": "tree.xie"
+		}`)
 		return nil
 	})
-	d.ListenAndServe(":7001")
+	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
new file mode 100644
index 0000000..9e103cb
--- /dev/null
+++ b/example/main.go
@@ -0,0 +1,33 @@
+package main
+
+import (
+	"bytes"
+	"time"
+
+	"github.com/vicanso/elton"
+
+	routerLimiter "github.com/vicanso/elton-router-concurrent-limiter"
+)
+
+func main() {
+	e := elton.New()
+
+	e.Use(routerLimiter.New(routerLimiter.Config{
+		Limiter: routerLimiter.NewLocalLimiter(map[string]uint32{
+			"GET /users/me": 2,
+		}),
+	}))
+
+	e.GET("/users/me", func(c *elton.Context) (err error) {
+		time.Sleep(time.Second)
+		c.BodyBuffer = bytes.NewBufferString(`{
+			"account": "tree",
+			"name": "tree.xie"
+		}`)
+		return nil
+	})
+	err := e.ListenAndServe(":3000")
+	if err != nil {
+		panic(err)
+	}
+}
diff --git a/go.mod b/go.mod
index 0eedbf1..4170e8c 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/vicanso/elton-router-concurrent-limiter
 go 1.12
 
 require (
-	github.com/stretchr/testify v1.3.0
-	github.com/vicanso/elton v0.2.0
+	github.com/stretchr/testify v1.4.0
+	github.com/vicanso/elton v0.2.2
 	github.com/vicanso/hes v0.2.1
 )
diff --git a/go.sum b/go.sum
index c2e96a9..5cd9e0b 100644
--- a/go.sum
+++ b/go.sum
@@ -1,15 +1,21 @@
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/julienschmidt/httprouter v1.2.0 h1:TDTW5Yz1mjftljbcKqRcrYhd4XeOoI98t+9HbQbYf7g=
-github.com/julienschmidt/httprouter v1.2.0/go.mod h1:SYymIcj16QtmaHHD7aYtjjsJG7VTCxuUUipMqKk8s4w=
+github.com/julienschmidt/httprouter v1.3.0 h1:U0609e9tgbseu3rBINet9P48AI/D3oJs4dN7jwJOQ1U=
+github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8IZAc4RVcycCCAKdM=
 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/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-github.com/vicanso/elton v0.2.0 h1:QlXgmq6m+9wZN7FeLD25/EhBkl8blzppviVY5U5PTm0=
-github.com/vicanso/elton v0.2.0/go.mod h1:ynAUOSkZQ+pFaUsxlG5hYnJFjPpMwz8YyEBPzNh0pSg=
+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/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=
+github.com/vicanso/intranet-ip v0.0.1/go.mod h1:bqQ6VUhxdz0ipSb1kzd6aoZStlp+pB7CTlVmVhgLAxA=
 github.com/vicanso/keygrip v0.1.0 h1:/zYzoVIbREAvaxSM7bo3/oSXuuYztaP71dPBfhRoNkM=
 github.com/vicanso/keygrip v0.1.0/go.mod h1:cI05iOjY00NJ7oH2Z9Zdm9eJPUkpoex3XnEubK78nho=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=