Apache mod_expires

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http://serverfault.com – I am rather confused with the whole access and modification. I want the files to be cached until they are modified. If the data is the same, show cache version. If data has changed, download updated version and cache it. I don't see why you would want anything different? All this access plus 6 months is not making sense to me. Request a new file if the last modified date is newer than the cache date. Can this not be done in such a simple manner? I want to be able to create index.html on 1/1/2012 and have everyone cache it. I don't want it to be downloaded again until I edit it. Say I edit (HowTos)