private void doSleep() {
        if (sleep > 0) {
            try {
                Thread.sleep(sleep);
            } catch (Exception e) { // NOPMD
            }
        }
    }
@author <a href="mailto:zhanggeng.zg@antfin.com">GengZhang</a>
test/test-integration/src/test/java/com/alipay/sofa/rpc/server/http/HttpServiceImpl.java