public static Channel getMainChannel(ChannelHandlerContext ctx) {
        return getMainChannel(ctx.channel());
    }
If http/1 then will always want to just use ChannelHandlerContext.channel(), but for http/2
will want the parent channel (as the child channel is different for each h2 stream).
zuul-core/src/main/java/com/netflix/zuul/util/HttpUtils.java