@Override
    public HttpMetricsChannelHandler getHttpMetricsHandler() {
        return httpMetricsHandler;
    }
This method can be overridden to add your own MethodBinding handler for preserving thread locals or thread variables.

This should be a handler that binds downstream channelRead and userEventTriggered with the
MethodBinding class. It should be added using the pipeline.addLast method.

@param pipeline the channel pipeline
zuul-core/src/main/java/com/netflix/zuul/netty/connectionpool/DefaultOriginChannelInitializer.java