private NameIntValuePair<String> getHost() {
        final InterceptorScopeInvocation transaction = interceptorScope.getCurrentInvocation();
        final Object attachment = getAttachment(transaction);
        if (attachment instanceof HttpCallContext) {
            HttpCallContext callContext = (HttpCallContext) attachment;
            return new NameIntValuePair<>(callContext.getHost(), callContext.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/HttpRequestExecutorExecuteMethodInterceptor.java