HTTP::header User-Agent question

when HTTP_REQUEST {
set wap https://wapsite.com/uri
set normal https://normal.com/uri
set smart https://smartphonesite.com/uri

 if { [HTTP::host] equals "https://mysite..com" } {
  if { [class match -- [string tolower [HTTP::header User-Agent]] contains user_agent_tokens_class] }{
    log local0. "wap phone"
    HTTP::redirect $wap
    return }
  elseif {[class match [string tolower [HTTP::header User-Agent]] contains mobile_device_providers] } {
    log local0. "smart phone"
    HTTP::redirect $smart
    return }
  else {
   log local0. "Normal web site"
   HTTP::redirect $normal
   }
}
}