请求者可以选择为请求排队但是不等待处理的完成。当执行其他工作时，要定时检查响应队列中的响应。
The requester can choose to enqueue a request but not wait for processing to complete, then periodically check for a response in the response queue while it performs other work.
排队的请求的响应时间会增加，因为在得到服务之前它们会在队列中花费一段时间。
The queued traffic sees an increased response time since it spends some amount of time in a queue prior to being serviced.
这意味着，这两类请求都会在队列中花费一段时间，但是gold请求排队的时间比例比较小。
This means that both types of requests will spend some time in the queue, but the gold requests will be queued for proportionately less time.
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