diff --git a/api.go b/api.go
index bc6acb3..9a2f41e 100644
--- a/api.go
+++ b/api.go
@@ -1,6 +1,7 @@
 package api
 
 import (
+	"fmt"
 	"reflect"
 
 	"github.com/gin-gonic/gin"
@@ -12,7 +13,7 @@ import (
 var (
 	validate              = validator.New()
 	requestLogidGetter    = defaultLogidGetter
-	requestHandlerMapper  = map[string]Handler{}
+	requestHandlerMapper  = map[string]gin.HandlerFunc{}
 	errCodeUnknownError   = -10000
 	errCodeParameterError = -20000
 	errCodeUnimplementApi = -20401
@@ -56,7 +57,7 @@ func (e *Engine) POST(uri string, handler Handler) {
 // handlerWrapper
 func handlerWrapper(handler Handler) gin.HandlerFunc {
 	handlerFunc := handler.HandlerFunc()
-	return func(c *gin.Context) {
+	wrappedHandlerFunc := func(c *gin.Context) {
 		// Case 1. get request handler
 		if c.Request == nil && c.Keys != nil {
 			c.Keys["handler"] = handler
@@ -78,6 +79,9 @@ func handlerWrapper(handler Handler) gin.HandlerFunc {
 			return
 		}
 	}
+	hkey := fmt.Sprintf("%v", wrappedHandlerFunc)
+	requestHandlerMapper[hkey] = wrappedHandlerFunc
+	return wrappedHandlerFunc
 }
 
 // handlerWrapper
@@ -114,6 +118,9 @@ func middlewareMyApiEngine() gin.HandlerFunc {
 
 		// Step 3. do request
 		c.Next()
+
+		// Step 4. recorde metrics
+		cc.recordMetrics()
 	}
 }
 
@@ -141,8 +148,17 @@ func CC(c *gin.Context) *Context {
 }
 
 func ApiHandler(c *gin.Context) Handler {
-	newc := &gin.Context{Request: nil, Keys: map[string]any{}}
-	c.Handler()(newc)
+	h := c.Handler()
+	hkey := fmt.Sprintf("%v", h)
+	if _, ok := requestHandlerMapper[hkey]; !ok {
+		return nil
+	}
+
+	newc := &gin.Context{
+		Request: nil,
+		Keys:    map[string]any{},
+	}
+	h(newc)
 	return newc.Keys["handler"].(Handler)
 }
 
@@ -157,7 +173,7 @@ func RecordMetrics(api, errcode, appid string, costms float64) {
 	summary.Observe(costms)
 }
 
-func DumpHandler(c *Context) error {
+func DumpHandlerFunc(c *Context) error {
 	errmsg := "api not implemented"
 	errcode := errCodeUnimplementApi
 	return c.RESULT_ERROR(errcode, errmsg)
diff --git a/context.go b/context.go
index adb5e65..0959b9f 100644
--- a/context.go
+++ b/context.go
@@ -150,8 +150,6 @@ func (c *Context) RESULT(output interface{}) error {
 		noticeStr := fmt.Sprintf("cost: %dms, output: '%s'", cost, string(b))
 		log.NoticefWithDepth(calldepth, noticeStr)
 
-		//////// metrics //////////////////////////////////
-		c.recordMetrics()
 	}(&output)
 
 	if _, ok := t.FieldByName("ErrCode"); !ok {
@@ -220,8 +218,11 @@ func (c *Context) recordMetrics() {
 		metricApiSummary == nil {
 		return
 	}
+	var h = c.ApiHandler()
+	if h == nil {
+		h = unimplementHandler{c.Context}
+	}
 	var (
-		h       = c.ApiHandler()
 		api     = h.ApiName()
 		appid   = c.AppId
 		costus  = time.Now().Sub(c.starttime).Microseconds()
diff --git a/routes.go b/routes.go
index 90eb6fa..fe48b6d 100644
--- a/routes.go
+++ b/routes.go
@@ -1,5 +1,12 @@
 package api
 
+import (
+	"fmt"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
 // ///////////////////////////////////////////////////////////////////
 // IRouter & IRoutes in gin, we redefine it simple
 // ///////////////////////////////////////////////////////////////////
@@ -42,3 +49,16 @@ type HandlerFunc func(*Context) error
 type IRoutes interface {
 	POST(uri string, handler Handler)
 }
+
+type unimplementHandler struct {
+	c *gin.Context
+}
+
+func (u unimplementHandler) ApiName() string {
+	req := u.c.Request
+	return strings.ToLower(fmt.Sprintf("[%s]%s", req.Method, req.RequestURI))
+}
+
+func (u unimplementHandler) HandlerFunc() HandlerFunc {
+	return DumpHandlerFunc
+}