protected void addTcpRelatedHandlers(ChannelPipeline pipeline) {
        pipeline.addLast(sourceAddressChannelHandler);
        pipeline.addLast(perEventLoopConnectionMetricsHandler);
        new ElbProxyProtocolChannelHandler(registry, withProxyProtocol).addProxyProtocol(pipeline);

        pipeline.addLast(maxConnectionsHandler);
    }
Call {@link #BaseZuulChannelInitializer(String, ChannelConfig, ChannelConfig, ChannelGroup)} instead.
zuul-core/src/main/java/com/netflix/zuul/netty/server/BaseZuulChannelInitializer.java