Rewrite https request to http node IP and Port

ok so the following irule works in a sense it matches fqdn and redirects to instructed node and port.. thats working perfect.

when HTTP_REQUEST {
 
  switch -glob [HTTP::host] {
    fqdn1 { 
	HTTP::header replace Host "????" # < --- I want to replace the IP of node with the fqdn to verify certificate
	HTTP::redirect http://node:port1[HTTP::uri]
	if { [HTTP::uri] starts_with "/uri-X" } { HTTP::redirect http://node:port2[HTTP::uri] }
	}
    fqdn2 { 
	HTTP::header replace Host "????"
	HTTP::redirect http://node:port3[HTTP::uri]
	if { [HTTP::uri] starts_with "/uri-X" } { HTTP::redirect http://node:port4[HTTP::uri] }
	}
    fqdn3 { 
	HTTP::header replace Host "???"
	HTTP::redirect http://node:port5[HTTP::uri]
	if { [HTTP::uri] starts_with "/uri-X" } { HTTP::redirect http://node:port6[HTTP::uri] }
	}
  }
}

But... the rewrite of host is not working. I tried putting in node IP, the fqdn etc but no dice... if this somehow works i will be happy 🙂

what am I missing??