Expires 和 Cache-Control 标头有什么区别? [英] what’s the difference between Expires and Cache-Control headers?

问题描述

Expires 和 Cache-Control 标头有什么区别?

What’s the difference between Expires and Cache-Control headers?

推荐答案

Cache-Control 是在 HTTP/1.1 中引入的，提供了比 Expires 更多的选项.它们可以用来完成同样的事情，但 Expires 的数据值是 HTTP 日期，而 Cache-Control max-age 允许您指定相对时间量，以便您可以指定请求页面后 X 小时".

Cache-Control was introduced in HTTP/1.1 and offers more options than Expires. They can be used to accomplish the same thing but the data value for Expires is an HTTP date whereas Cache-Control max-age lets you specify a relative amount of time so you could specify "X hours after the page was requested".

HTML Cache control 是一个非常相似的问题，并且有一个很好的链接到缓存教程，应该回答您的大部分问题(例如，http://www.mnot.net/cache_docs/#EXPIRES).总而言之，当您需要更多地控制缓存的完成方式时，建议将 Expires 用于图像和 Cache-Control 等静态资源.

HTML Cache control is a very similar question and has a good link to a caching tutorial that should answer most of your questions (e.g., http://www.mnot.net/cache_docs/#EXPIRES). To sum up though, Expires is recommended for static resources like images and Cache-Control when you need more control over how caching is done.

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