use Clear-Site-Data in settings

server/routes/settings.go

@@ -156,6 +156,10 @@ func setFilter(w http.ResponseWriter, r *http.Request) (string, error) {
 }
 
 func setLogout(w http.ResponseWriter, _ *http.Request) (string, error) {
+	// Clear-Site-Data header with wildcard to clear everything
+	w.Header().Set("Clear-Site-Data", "*")
+
+	// Cookie clearing as fallback
 	session.ClearCookie(w, session.Cookie_Token)
 	session.ClearCookie(w, session.Cookie_CSRF)
 	return i18n.Sprintf("Successfully logged out."), nil
@@ -217,6 +221,10 @@ func setRawCookie(w http.ResponseWriter, r *http.Request) (string, error) {
 }
 
 func resetAll(w http.ResponseWriter, _ *http.Request) (string, error) {
+	// Clear-Site-Data header with wildcard to clear everything
+	w.Header().Set("Clear-Site-Data", "*")
+
+	// Cookie clearing as fallback
 	session.ClearAllCookies(w)
 	return i18n.Sprintf("All preferences have been reset to default values."), nil
 }