• 1. Last-Modified time: 或最终更改时间 | 最后修改时间
• 2. Last Modified Time: 时间

• 1.For example, we could move the last-modified time for our file a minute further into the future.
  例如，我们可以不断地更新文件的最后修改时间。
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• 2.If the content is stale, the browser sends a request to the server to compare the Last-Modified time stamp.
  如果内容失效，浏览器将发送一个请求到服务器以比较Last - Modified时间戳。
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• 3.If the response file has the same Last-Modified time stamp, the server returns code 304 to the browser to tell it that the response file is the same.
  如果响应文件拥有相同的Last - Modified时间戳，则服务器将返回代码304到浏览器，告知浏览器响应文件相同。
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