March 2003
Intermediate to advanced
312 pages
7h 12m
English
Content preview from HTTP Developer’s Handbook
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Last-Modified
The Last-Modified header contains a date in HTTP format (See Chapter 9, “Formatting Specifications,” for more information about date formats). This date is used in many calculations to determine the age of a resource, especially by caching systems.
Last-Modified: Tue, 21 May 2002 12:34:56 GMT
The Last-Modified header can be calculated in different ways. For static content being returned by the Web server, it usually indicates the last modification date of the file, although some filesystem operations can alter the last modification date without actually altering the content. For dynamic content, it might be the current date or the date of the most recently modified dynamic part.
As a developer, you should try to ensure the accuracy ...
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