[irule] header rewrite for Local cache V 9.x

when HTTP_REQUEST {
      
if {[HTTP::method] eq "GET" and [HTTP::uri] eq "/"}{  
 set expire_content_timeout 300      
  } else {    
set expire_content_timeout [findclass [string tolower [string range [HTTP::path] [string last . [HTTP::path]] end]] $::class_cacheable_file_types " "]

log local0.debug "$expire_content_timeout" 
#log local0.debug "[string tolower [string range [HTTP::path] [string last . [HTTP::path]] end]]"
  }      }   
    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}    
        }   
  }