iRule to exclude certain content type from ram cache

 
class bypass_ram_cache_filetypes {
   {
      "mp3"
      "pdf"
      "wmv"
   }
}

rule bypass_ram_cache_by_filetype {
   when HTTP_REQUEST {
        if { [class match [HTTP::path] ends_with $::bypass_ram_cache_filetypes] } {
                log local0. "RAM Cache bypassed for [HTTP::path]"
                CACHE::disable
        }
}
}