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In the HttpServletResponse header what does expire date mean

 
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I am going to write a last-modified header onto a file




Found this example, understand all it apart from the Expires, just need to know the significance of the date, so I know what date to set.

Thanks for any Help
 
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Those are HTTP headers therefore you must look in the HTTP specification:

http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.21
"The Expires entity-header field gives the date/time after which the response is considered stale"

http://en.wikipedia.org/wiki/List_of_HTTP_header_fields#Expires

Cheers,
 
Tony Evans
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Thanks Gonzalez-Morris that makes sense so if the date is set in the past the data will always be stale an so every time a file with that header is accesed it will be the latest an not the cache file.
 
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