private void http1Handlers(ChannelPipeline pipeline) {
        addHttpRelatedHandlers(pipeline);
        addZuulHandlers(pipeline);
    }
Use {@link #Http2SslChannelInitializer(String, ChannelConfig, ChannelConfig, ChannelGroup)} instead.
zuul-core/src/main/java/com/netflix/zuul/netty/server/http2/Http2SslChannelInitializer.java