Dokumentationen for cache-styring finder du her:
http://www.w3.org/Protocols/
ftp://ftp.isi.edu/in-notes/rfc2616.txt
Kig bl.a. på:
Cache-Control   = "Cache-Control" ":" 1#cache-directive
    cache-directive = cache-request-directive
         | cache-response-directive
    cache-request-directive =
           "no-cache"                          ; Section 14.9.1
         | "no-store"                          ; Section 14.9.2
         | "max-age" "=" delta-seconds         ; Section 14.9.3, 14.9.4
         | "max-stale" [ "=" delta-seconds ]   ; Section 14.9.3
         | "min-fresh" "=" delta-seconds       ; Section 14.9.3
         | "no-transform"                      ; Section 14.9.5
         | "only-if-cached"                    ; Section 14.9.4
         | cache-extension                     ; Section 14.9.6
     cache-response-directive =
           "public"                               ; Section 14.9.1
         | "private" [ "=" <"> 1#field-name <"> ] ; Section 14.9.1
         | "no-cache" [ "=" <"> 1#field-name <"> ]; Section 14.9.1
         | "no-store"                             ; Section 14.9.2
         | "no-transform"                         ; Section 14.9.5
         | "must-revalidate"                      ; Section 14.9.4
         | "proxy-revalidate"                     ; Section 14.9.4
         | "max-age" "=" delta-seconds            ; Section 14.9.3
         | "s-maxage" "=" delta-seconds           ; Section 14.9.3
         | cache-extension                        ; Section 14.9.6
    cache-extension = token [ "=" ( token | quoted-string ) ]
Med hensyn til http/1.0, kig på sektion 14.32.
Du bør også sætte Last-Modified, da denne hentes ved visse forespørgsler, og 
hele siden kun hentes hvis denne er ændret.
Hilsen,
Lars Dybdahl.
-- 
Freelance programmør
Programmering mod timebetaling