irule problem after upgrade from v9 to v11

After upgrading from v9 to v11.2, irule got some problem.

 

before upgrade

 

 

class http_list {

 

"abc.com abc-r.com abc-r_pool"

 

"xyz.com xyz-r.com xyz-r_pool"

 

"123.com 123-r.com 123-r_pool"

 

}

 

 

when HTTP_REQUEST {

 

set rp_list $::http_list

 

set host [HTTP::host]

 

set proxy_host_entry [findclass [string tolower $host] $rp_list]

 

if { $proxy_host_entry ne "" } {

 

set rp_host [getfield $proxy_host_entry " " 2]

 

set rp_pool [getfield $proxy_host_entry " " 3]

 

HTTP::header replace "Host" $rp_host

 

pool $rp_pool

 

}

 

}

 

 

After upgrade

 

ltm data-group internal /Common/http_list {

 

records {

 

"abc.com abc-r.com abc-r_pool" { }

 

"xyz.com xyz-r.com xyz-r_pool" { }

 

"123.com 123-r.com 123-r_pool" { }

 

}

 

type string

 

}

 

 

However should I convert the irule to work in v11.2?