protected void storeChannel(Channel ch) {
        this.channels.add(ch);

        // Also add the ChannelConfig as an attribute on each channel. So interested filters/channel-handlers can
        // introspect
        // and potentially act differently based on the config.
        ch.attr(ATTR_CHANNEL_CONFIG).set(channelConfig);
    }
Call {@link #BaseZuulChannelInitializer(String, ChannelConfig, ChannelConfig, ChannelGroup)} instead.
zuul-core/src/main/java/com/netflix/zuul/netty/server/BaseZuulChannelInitializer.java