diff --git a/libv2ray_main.go b/libv2ray_main.go
index 4a47da4..5724e00 100644
--- a/libv2ray_main.go
+++ b/libv2ray_main.go
@@ -16,9 +16,9 @@ import (
 
 	mobasset "golang.org/x/mobile/asset"
 
-	v2core "github.com/xtls/xray-core/core"
 	v2net "github.com/xtls/xray-core/common/net"
 	v2filesystem "github.com/xtls/xray-core/common/platform/filesystem"
+	v2core "github.com/xtls/xray-core/core"
 	v2stats "github.com/xtls/xray-core/features/stats"
 	v2serial "github.com/xtls/xray-core/infra/conf/serial"
 	_ "github.com/xtls/xray-core/main/distro/all"
@@ -29,11 +29,12 @@ import (
 )
 
 const (
-	v2Asset = "xray.location.asset"
+	v2Asset     = "xray.location.asset"
 	xudpBaseKey = "xray.xudp.basekey"
 )
 
-/*V2RayPoint V2Ray Point Server
+/*
+V2RayPoint V2Ray Point Server
 This is territory of Go, so no getter and setters!
 */
 type V2RayPoint struct {
@@ -115,7 +116,7 @@ func (v *V2RayPoint) StopLoop() (err error) {
 	return
 }
 
-//Delegate Funcation
+// Delegate Funcation
 func (v V2RayPoint) QueryStats(tag string, direct string) int64 {
 	if v.statsManager == nil {
 		return 0
@@ -165,7 +166,7 @@ func (v *V2RayPoint) pointloop() error {
 	return nil
 }
 
-func (v *V2RayPoint) MeasureDelay() (int64, error) {
+func (v *V2RayPoint) MeasureDelay(url string) (int64, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), 12*time.Second)
 
 	go func() {
@@ -177,7 +178,7 @@ func (v *V2RayPoint) MeasureDelay() (int64, error) {
 		}
 	}()
 
-	return measureInstDelay(ctx, v.Vpoint)
+	return measureInstDelay(ctx, v.Vpoint, url)
 }
 
 // InitV2Env set v2 asset path
@@ -201,13 +202,7 @@ func InitV2Env(envPath string, key string) {
 	}
 }
 
-//Delegate Funcation
-func TestConfig(ConfigureFileContent string) error {
-	_, err := v2serial.LoadJSONConfig(strings.NewReader(ConfigureFileContent))
-	return err
-}
-
-func MeasureOutboundDelay(ConfigureFileContent string) (int64, error) {
+func MeasureOutboundDelay(ConfigureFileContent string, url string) (int64, error) {
 	config, err := v2serial.LoadJSONConfig(strings.NewReader(ConfigureFileContent))
 	if err != nil {
 		return -1, err
@@ -225,7 +220,7 @@ func MeasureOutboundDelay(ConfigureFileContent string) (int64, error) {
 	}
 
 	inst.Start()
-	delay, err := measureInstDelay(context.Background(), inst)
+	delay, err := measureInstDelay(context.Background(), inst, url)
 	inst.Close()
 	return delay, err
 }
@@ -248,15 +243,16 @@ func NewV2RayPoint(s V2RayVPNServiceSupportsSet, adns bool) *V2RayPoint {
 	}
 }
 
-/*CheckVersionX string
+/*
+CheckVersionX string
 This func will return libv2ray binding version and V2Ray version used.
 */
 func CheckVersionX() string {
-	var version  = 26
+	var version = 26
 	return fmt.Sprintf("Lib v%d, Xray-core v%s", version, v2core.Version())
 }
 
-func measureInstDelay(ctx context.Context, inst *v2core.Instance) (int64, error) {
+func measureInstDelay(ctx context.Context, inst *v2core.Instance, url string) (int64, error) {
 	if inst == nil {
 		return -1, errors.New("core instance nil")
 	}
@@ -278,14 +274,18 @@ func measureInstDelay(ctx context.Context, inst *v2core.Instance) (int64, error)
 		Timeout:   12 * time.Second,
 	}
 
-	req, _ := http.NewRequestWithContext(ctx, "GET", "https://www.google.com/generate_204", nil)
+	if len(url) <= 0 {
+		url = "https://www.google.com/generate_204"
+	}
+	req, _ := http.NewRequestWithContext(ctx, "GET", url, nil)
 	start := time.Now()
 	resp, err := c.Do(req)
 	if err != nil {
 		return -1, err
 	}
-	if resp.StatusCode != http.StatusNoContent {
-		return -1, fmt.Errorf("status != 204: %s", resp.Status)
+
+	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusNoContent {
+		return -1, fmt.Errorf("status != 20x: %s", resp.Status)
 	}
 	resp.Body.Close()
 	return time.Since(start).Milliseconds(), nil
@@ -312,4 +312,4 @@ func createStdoutLogWriter() v2commlog.WriterCreator {
 		return &consoleLogWriter{
 			logger: log.New(os.Stdout, "", 0)}
 	}
-}
\ No newline at end of file
+}