} finally {
            Response curResp = response;
            Request curReq = request;
            while (curResp != null) {
                this.response_map.remove(curResp.getMid());
                final Request next = curReq.getNext();
                if (next == null) {
                    break;
                }
                curReq = next;
                curResp = next.getResponse();
            }
        }