HTTP 1.1介绍了另外一组头信息属性：Cache - Control响应头信息，让网站的发布者可以更全面的控制他们的内容，并定位过期时间的限制。

HTTP 1.1 introduced a new class of headers, Cache-Control response headers, to give Web publishers more control over their content, and to address the limitations of Expires.

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这样看起来一些限制条款可能是过时了，因此我们正准备要做全面的审核。

And some of these restrictions may be outdated, so we're going to be doing a comprehensive review.

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