plz chk. cache rule & header rewrite rule

hi just a simple question.

 

i want selcetive cache & Header Rewrite rule

 

is that wrong?

 

can anyone advise me please?

 

many thanks!

 

 

 

when HTTP_REQUEST {

 

if { [class match [HTTP::uri] contains class_cacheable_file_types] }

 

{ CACHE::enable }

 

else { CACHE::disable }

 

 

 

if {[HTTP::method] eq "GET" and [HTTP::uri] eq "/"}{

 

set expire_content_timeout 300

 

}else{

 

set expire_content_timeout [class match -value [string tolower [string range [HTTP::path] [string last . [HTTP::path]] end]] starts_with class_cacheable_file_types] } }

 

 

 

when HTTP_RESPONSE { if { $expire_content_timeout ne "" } {

 

HTTP::header replace "Cache-Control" "max-age=$expire_content_timeout, public" HTTP::header replace "Expires" "[clock format [expr ([clock seconds]+$expire_content_timeout)] -format "%a, %d %h %Y %T GMT" -gmt true]"

 

} else {

 

HTTP::header replace "Cache-Control" "private"

 

HTTP::header replace Expires {-1} } }

 

 

 

 

--------datagroup---------------

 

class_cacheable_file_types

 

 

".jpeg" { "86400" }

 

...