HTTP::cookie - How can I handle cookies with duplicate names but diffrent domain value?

when HTTP_RESPONSE {
 set CookieCounter 0
 foreach SetCookieHeader [HTTP::header values Set-Cookie] {
    incr CookieCounter
    log local0. "Saving Set-Cookie header value in array, index number = $CookieCounter, Value = $SetCookieHeader"
    set CookieArray("$CookieCounter") "$SetCookieHeader"
    }
 HTTP::header remove "Set-Cookie"
 log local0. "Removing Set-Cookie HTTP headers"
 foreach {Index Cookie} [array get CookieArray] {
    if { $Cookie contains "iPlanetDirectoryPro" } {
       HTTP::header insert "$Cookie; HttpOnly"
       log local0. "Inserting cookie - $Cookie; HttpOnly"
       }
    else {
       HTTP::header insert "$Cookie"
       log local0. "Inserting cookie - $Cookie"
       }
    }
}