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up.protocol Last-Modified
HTTP header

This response header contains the time when the content in the response body was last modified.

Last modification times can be used to prevent unnecessary re-rendering of unchanged content. See Conditional requests for details and examples.


The header value is a date/time in RFC 1123 format:

Last-Modified: Wed, 15 Nov 2000 13:11:22 GMT

For a readable description of the time format, see MDN.


Instead of sending this header, the server may also render fragments with [up-time] attributes.