mod_expires > Why are both the Expires and Cache-Control HTTP headers set?

["Geoff Millikan" <gmillikan@xxxxxxxxxxxxx>]

The HTTP spec linked below says, "Servers specify explicit expiration times
using *either* the Expires header, or the max-age directive of the
Cache-Control header."

So why then does mod_expires set *both* the Expires HTTP header *and* the
max-age directive of the Cache-Control HTTP header?  It's overkill to set
both, right? 

http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.2.1

http://httpd.apache.org/docs/2.2/mod/mod_expires.html

Thanks,

http://www.t1shopper.com/

PS. It would be great if mod_expires had a Directive something like
"ExpiresHeader" where the syntax could be something like
Expires|Cache-Control|All

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