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What defines the date when information becomes invalid?(a) last-modified: string(b) expires: date string(c) last-modified: string(d) content-type: stringI got this question in exam.I want to ask this question from CSS Transition, Perl cgi Programming topic in division CGI Programming & Miscellaneous of CSS

Answer»

The correct option is (b) expires: date STRING

To explain I would say: expires: sate string defines the date when information becomes invalid. This should be used by the browser to decide when a page needs to be REFRESHED. A valid date string should be in the FORMAT 01 JAN 1998 12:00:00 GMT.



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