如果目标电脑关闭，您仍然可以尝试获取的mac按钮，因为它可以搜索缓存中。
If the target computer is off, you can still try the get MAC button because it can search in the cache.
为了提速，您可以高速缓存从搜索查询得到的结果，然后在用户每次提交查询时使用这些缓存的结果。
To speed this up, you can cache the results from a search query and use these cached results whenever a user submits a query.
接收请求的缓存代理将在其缓存中搜索可能已经存在的匹配响应。
A caching proxy that receives a request searches for matching responses that might already exist in its cache.
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