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文字

Last-Modified响应HTTP报头包含在其原始服务器认为该资源的最后修改日期和时间。它被用作验证器来确定接收或存储的资源是否相同。不如ETag标题准确,它是一种回退机制。包含条件请求If-Modified-SinceIf-Unmodified-Since标题使用此字段。

Header type

Response header

Forbidden header name

no

CORS-safelisted response-header

yes

句法

Last-Modified: <day-name>, <day> <month> <year> <hour>:<minute>:<second> GMT

指令

<day-name> “星期一”,“星期二”,“星期三”,“星期四”,“星期五”,“星期六”或“太阳”之一(区分大小写)。 “04”或“23”<月>“Jan”,“Feb”,“Mar”,“Apr”,“May”,“Jun”,“Jul”,“Aug”,“Sep”,“十进制“,”十一月“,”十二月“(区分大小写)<year> 4位数年份编号,例如”1990“或”2016“。<小时> 2位数小时编号,例如”09“或”23“分钟> 2位数分钟数,例如“04”或“59”。<秒> 2位数秒数,例如“04”或“59”。GMT

格林威治标准时间。HTTP 日期总是以 GMT 表示,从不以本地时间表示。

例子

Last-Modified: Wed, 21 Oct 2015 07:28:00 GMT

产品规格

Specification

Title

RFC 7232, section 2.2: Last-Modified

Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests

浏览器兼容性

Feature

Chrome

Edge

Firefox

Internet Explorer

Opera

Safari

Basic Support

(Yes)

(Yes)

(Yes)

(Yes)

(Yes)

(Yes)

Feature

Android

Chrome for Android

Edge mobile

Firefox for Android

IE mobile

Opera Android

iOS Safari

Basic Support

(Yes)

(Yes)

(Yes)

(Yes)

(Yes)

(Yes)

(Yes)

请参阅

  • If-Modified-Since

  • If-Unmodified-Since

  • Etag

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