irule for redirect and header injection

Hi, 

Can you try this, if possible, i am not checked the syntax, just created as per requirement.

when HTTP_REQUEST {
    if { [ACCESS::policy result] eq "allow" } {
        set username [ACCESS::session data get "session.logon.last.username"]
        if { $username ne "" } {
            HTTP::header insert "X-Authenticated-User" $username
        }
    }
}