protected void addPassportHandler(ChannelPipeline pipeline) {
        pipeline.addLast(new ServerStateHandler.InboundHandler(registry, "http-" + metricId));
        pipeline.addLast(new ServerStateHandler.OutboundHandler(registry));
    }
Call {@link #BaseZuulChannelInitializer(String, ChannelConfig, ChannelConfig, ChannelGroup)} instead.
zuul-core/src/main/java/com/netflix/zuul/netty/server/BaseZuulChannelInitializer.java