private NameIntValuePair<String> getHost(final Object target) {
        if (target instanceof RequestProducerGetter) {
            final HttpAsyncRequestProducer producer = ((RequestProducerGetter) target)._$PINPOINT$_getRequestProducer();
            final HttpHost httpHost = producer.getTarget();
            if (httpHost != null) {
                return new NameIntValuePair<>(httpHost.getHostName(), httpHost.getPort());
            }
        }
        return new NameIntValuePair<>(null, -1);
    }
@author minwoo.jung
@author jaehong.kim
agent-module/plugins/httpclient4/src/main/java/com/navercorp/pinpoint/plugin/httpclient4/interceptor/DefaultClientExchangeHandlerImplStartMethodInterceptor.java