Passing a header value to lb to pool

Sorry, forgot to format the code section

Code
when RULE_INIT {
set newpool "";
}

when HTTP_RESPONSE {
  if { [HTTP::header exists "X-Load-Balancer-Pool"] }  { 
    set newpool [HTTP::header value "X-Load-Balancer-Pool" ]
    log local0. "Header found to be $newpool"
    HTTP::cookie insert name "Load-Balancer-Pool-cookie" value "$newpool"
  } else {
    log local0. "Header not found $newpool" 
    return 
  }
}

when HTTP_REQUEST {
  if { [HTTP::cookie exists "Load-Balancer-Pool-cookie"] }  { 
    set cookie_pool [HTTP::cookie value "Load-Balancer-Pool-cookie" ]
    log local0. "Header found to be $cookie_pool"
    pool $cookie_pool
  } else {
    log local0. "pool not found" 
    return 
  }
}