protected void addTimeoutHandlers(ChannelPipeline pipeline) {
        pipeline.addLast(new IdleStateHandler(0, 0, idleTimeout, TimeUnit.MILLISECONDS));
        pipeline.addLast(new CloseOnIdleStateHandler(registry, metricId));
    }
Call {@link #BaseZuulChannelInitializer(String, ChannelConfig, ChannelConfig, ChannelGroup)} instead.
zuul-core/src/main/java/com/netflix/zuul/netty/server/BaseZuulChannelInitializer.java