private IClientConfig getRibbonClientConfig(ClientConfig rxClientConfig) {
        if (rxClientConfig != null && rxClientConfig.isReadTimeoutSet()) {
            return IClientConfig.Builder.newBuilder().withReadTimeout((int) rxClientConfig.getReadTimeoutInMillis()).build();
        }
        return null;
    }
@return ClientConfig that is merged from IClientConfig and ClientConfig in the method arguments
ribbon-transport/src/main/java/com/netflix/ribbon/transport/netty/http/LoadBalancingHttpClient.java