Help with irule structure

hi

so if you wanted to use a data group, then the code would look something like...

   when HTTP_REQUEST {
      set app_pool [class match -value -- [HTTP::header value "USER_COD"] eq cod_value]
      if {$app_pool ne ""} {
         pool $app_pool
      } else {
         pool default_pool
      }
   }

...where cod_value is the name of the data group

ltm data-group internal /Common/cod_value {

  records {

    DG_01 {

      data Pool_01

    }

  }

  type string

}