URL redirect when URL is lacking a domain name

here is the iRule I have built. It doesn't seem to be working as the FQDN doesn't appear to be getting passed on to the authentication piece of our app. In the browser, the user enters "http://chargeit", they are then taken to a login screen. That screen requires the FQDN for authentication. That being "chargeit-test.avnet.com".

 

 

when HTTP_REQUEST {

 

if { [HTTP::host] eq "chargeit-test" } {

 

HTTP::header replace "Host" "chargeit-test.avnet.com"

 

}

 

}