protected void copyAttrsFromParentChannel(Channel parent, Channel child) {
        for (AttributeKey<?> key : ATTRIBUTES_TO_COPY) {
            copyAttributesFromParentChannel(parent, child, key);
        }
    }
TODO - can this be done when we create the Http2StreamChannelBootstrap instead now?
zuul-core/src/main/java/com/netflix/zuul/netty/server/http2/Http2StreamInitializer.java