diff --git a/test-ee.go b/test-ee.go
index fea6532..fa8e6ae 100644
--- a/test-ee.go
+++ b/test-ee.go
@@ -5,3 +5,33 @@ import "fmt"
 func test()  {
 	fmt.Println("testfffaa")
 }
+
+func (d *Oauth2ConfigurationUsecase) backendLogout(ctx context.Context, configuration *Oauth2Configuration, idToken string) error {
+	logoutUrl, err := url.Parse(configuration.ServerLogoutUrl)
+	if err != nil {
+		return fmt.Errorf("parse logout url failed: %v", err)
+	}
+	query := logoutUrl.Query()
+	for key := range query {
+		val := query.Get(key)
+		if val == userVariableIdToken {
+			query.Set(key, idToken)
+		} else if val == userVariableSqleUrl {
+			query.Del(key)
+		}
+	}
+	logoutUrl.RawQuery = query.Encode()
+	logoutUrlStr := logoutUrl.String()
+	d.log.Infof("backendLogout url: %s", logoutUrlStr)
+
+	client := &http.Client{Timeout: time.Minute}
+	resp, err := client.Get(logoutUrlStr)
+	if err != nil {
+		return fmt.Errorf("request logout url failed: %v", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("request logout url resp Status: %v", resp.Status)
+	}
+	return nil
+}