diff --git a/api.go b/api.go
index c9a6e9d..0bc31dd 100644
--- a/api.go
+++ b/api.go
@@ -1,12 +1,19 @@
 package eureka_client
 
 import (
+	"errors"
 	"fmt"
+	"net/http"
 	"net/url"
 
 	"github.com/xuanbo/requests"
 )
 
+var (
+	// ErrNotFound 实例不存在，需要重新注册
+	ErrNotFound = errors.New("not found")
+)
+
 // 与eureka服务端rest交互
 // https://github.com/Netflix/eureka/wiki/Eureka-REST-operations
 
@@ -21,12 +28,12 @@ func Register(zone, app string, instance *Instance) error {
 		Instance: instance,
 	}
 
-	url := zone + "apps/" + app
+	u := zone + "apps/" + app
 
 	// status: http.StatusNoContent
-	result := requests.Post(url).Json(info).Send().Status2xx()
+	result := requests.Post(u).Json(info).Send().Status2xx()
 	if result.Err != nil {
-		return fmt.Errorf("Register application instance failed, error: %s", result.Err)
+		return fmt.Errorf("register application instance failed, error: %s", result.Err)
 	}
 	return nil
 }
@@ -34,11 +41,11 @@ func Register(zone, app string, instance *Instance) error {
 // UnRegister 删除实例
 // DELETE /eureka/v2/apps/appID/instanceID
 func UnRegister(zone, app, instanceID string) error {
-	url := zone + "apps/" + app + "/" + instanceID
+	u := zone + "apps/" + app + "/" + instanceID
 	// status: http.StatusNoContent
-	result := requests.Delete(url).Send().StatusOk()
+	result := requests.Delete(u).Send().StatusOk()
 	if result.Err != nil {
-		return fmt.Errorf("UnRegister application instance failed, error: %s", result.Err)
+		return fmt.Errorf("unRegister application instance failed, error: %s", result.Err)
 	}
 	return nil
 }
@@ -53,10 +60,10 @@ func Refresh(zone string) (*Applications, error) {
 	res := &Result{
 		Applications: apps,
 	}
-	url := zone + "apps"
-	err := requests.Get(url).Header("Accept", " application/json").Send().StatusOk().Json(res)
+	u := zone + "apps"
+	err := requests.Get(u).Header("Accept", " application/json").Send().StatusOk().Json(res)
 	if err != nil {
-		return nil, fmt.Errorf("Refresh failed, error: %s", err)
+		return nil, fmt.Errorf("refresh failed, error: %s", err)
 	}
 	return apps, nil
 }
@@ -68,9 +75,16 @@ func Heartbeat(zone, app, instanceID string) error {
 	params := url.Values{
 		"status": {"UP"},
 	}
-	result := requests.Put(u).Params(params).Send().StatusOk()
+	result := requests.Put(u).Params(params).Send()
 	if result.Err != nil {
-		return fmt.Errorf("Heartbeat failed, error: %s", result.Err)
+		return fmt.Errorf("heartbeat failed, error: %s", result.Err)
+	}
+	// 心跳 404 说明eureka server重启过，需要重新注册
+	if result.Resp.StatusCode == http.StatusNotFound {
+		return ErrNotFound
+	}
+	if result.Resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("heartbeat failed, invalid status code: %d", result.Resp.StatusCode)
 	}
 	return nil
 }
diff --git a/client.go b/client.go
index c6254d0..80f64e3 100644
--- a/client.go
+++ b/client.go
@@ -31,7 +31,7 @@ func (c *Client) Start() {
 		log.Println(err.Error())
 		return
 	}
-	log.Println("Register application instance successful")
+	log.Println("register application instance successful")
 	// 刷新服务列表
 	go c.refresh()
 	// 心跳
@@ -47,7 +47,7 @@ func (c *Client) refresh() {
 			if err := c.doRefresh(); err != nil {
 				log.Println(err)
 			} else {
-				log.Println("Refresh application instance successful")
+				log.Println("refresh application instance successful")
 			}
 		} else {
 			break
@@ -62,9 +62,16 @@ func (c *Client) heartbeat() {
 	for {
 		if c.Running {
 			if err := c.doHeartbeat(); err != nil {
+				if err == ErrNotFound {
+					log.Println("heartbeat Not Found, need register")
+					if err = c.doRegister(); err != nil {
+						log.Printf("do register error: %s\n", err)
+					}
+					continue
+				}
 				log.Println(err)
 			} else {
-				log.Println("Heartbeat application instance successful")
+				log.Println("heartbeat application instance successful")
 			}
 		} else {
 			break
@@ -118,12 +125,12 @@ func (c *Client) handleSignal() {
 		case syscall.SIGKILL:
 			fallthrough
 		case syscall.SIGTERM:
-			log.Println("Receive exit signal, client instance going to de-egister")
+			log.Println("receive exit signal, client instance going to de-register")
 			err := c.doUnRegister()
 			if err != nil {
 				log.Println(err.Error())
 			} else {
-				log.Println("UnRegister application instance successful")
+				log.Println("unRegister application instance successful")
 			}
 			os.Exit(0)
 		}
diff --git a/examples/main.go b/examples/main.go
index 138f8a7..5c03a28 100644
--- a/examples/main.go
+++ b/examples/main.go
@@ -11,7 +11,7 @@ import (
 func main() {
 	// create eureka client
 	client := eureka.NewClient(&eureka.Config{
-		DefaultZone:           "http://127.0.0.1:8080/eureka/",
+		DefaultZone:           "http://localhost:8761/eureka/",
 		App:                   "go-example",
 		Port:                  10000,
 		RenewalIntervalInSecs: 10,
diff --git a/go.mod b/go.mod
index fb5ff64..f6e351a 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,5 @@
 module github.com/xuanbo/eureka-client
 
+go 1.14
+
 require github.com/xuanbo/requests v0.0.1
diff --git a/readme-zh.md b/readme-zh.md
index 61aa21c..44d26a5 100644
--- a/readme-zh.md
+++ b/readme-zh.md
@@ -11,7 +11,7 @@
 
 ## 未完成
 
-* 当eureka服务端重启后，心跳404时支持重新注册
+* ~~当eureka服务端重启后，心跳404时支持重新注册~~
 
 * 以delta方式刷新服务列表（增量拉取）
 
diff --git a/readme.md b/readme.md
index 8a84886..4836269 100644
--- a/readme.md
+++ b/readme.md
@@ -11,7 +11,7 @@
 
 ## Todo
 
-* Re-Register
+* ~~Re-Register~~
 
 * Refresh by delta