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Amazon S3: is it possible to set HTTP expires headers *on access*?

in Apache’s mod_expires module (which allows you to set the Expires: header behavior), you can set a relative expiration header based on the access time of the file, eg,

ExpiresDefault “access plus 1 years”

.. The Cache-Control: max-age directive provides exactly what you’re asking for. For example:

Cache-Control: max-age=1314000

Tells CloudFront (and browsers) that they can cache the object for one year from the time it was originally fetched from the origin. We recommend that publishers set Cache-Control instead of Expires. Is there a reason you need Expires?