DNS Redirect by Port in Header

I am unable to get his to function properly and I believe it's the logic I have.

I am attempting to pass all traffic through with the exception of a port coming across in the url with the same fqdn and then passing that to another pool with the proper port on the back end.

Example:

happy.com

happy.com:1001

when HTTP_REQUEST {

"happy.com" {
         if { [HTTP::host] contains ":"} {
                     HTTP::header replace Host "[getfield [HTTP::host] : 1]"  
                     pool HAPPY_1001
         }
      pool HAPPY_443
 }

}