The Last-Modified entity header field value is often used as a cache validator.
Last-Modified实体头部字段值通常用作一个缓存验证器。
There is another header called the Content-Type header which is used to communicate the media type of the actual entity body.
还有另一种标头称为Content - Type标头，用来表达实际实体正文的媒体类型。
The Expires entity header field gives the date and time after which the response is considered stale.
Expires头部字段提供一个日期和时间，响应在该日期和时间后被认为失效。
The Expires entity header field gives the date and time after which the response is considered stale.
Expires头部字段提供一个日期和时间，响应在该日期和时间后被认为失效。
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