@Override
    public void stop() {
        try {
            eventLoopGroup.shutdownGracefully().sync();
            eventExecutor.shutdownGracefully().sync();
        } catch (Exception ignore) { // NOPMD
        }
        bootstrap = null;
    }
Add child options to the {@link io.netty.bootstrap.ServerBootstrap}.

@param channelOptions the additional child {@link io.netty.channel.ChannelOption}s.
@see io.netty.bootstrap.ServerBootstrap#childOption(io.netty.channel.ChannelOption, Object)
remoting/remoting-resteasy/src/main/java/com/alipay/sofa/rpc/server/rest/SofaNettyJaxrsServer.java