32 
キャッシュ(ヘッダ)


    cache-response-directive =
                                "public"
                              | "private" [ "=" <"> 1#field-name <"> ]
                              | "no-cache" [ "=" <"> 1#field-name <"> ]
                              | "no-store"
                              | "no-transform"
                              | "must-revalidate"
                              | "proxy-revalidate"
                              | "max-age" "=" delta-seconds
                              | "s-maxage" "=" delta-seconds
                              | cache-extension