filter should be always the same

router.go

@@ -611,6 +611,9 @@ func (p *ControllerRegistor) ServeHTTP(rw http.ResponseWriter, r *http.Request)
 		if p.enableFilter {
 			if l, ok := p.filters[pos]; ok {
 				for _, filterR := range l {
+					if filterR.returnOnOutput && w.started {
+						return true
+					}
 					if ok, params := filterR.ValidRouter(urlPath); ok {
 						for k, v := range params {
 							context.Input.Params[k] = v