Access-Control-Allow-Origin header missing?

[rkevinburton@xxxxxxxxxxx]

I have the following code to add the appropriate header then redirect 
but I am still getting an error that this header is missing. What am I 
doing wrong?

        header("HTTP/1.1 301 Moved Permanently");
        header("Access-Control-Allow-Origin: 
http://".$_SERVER['HTTP_HOST']);
        $augmentedUrl = $playbackbase."?authTicket=$authTicket";
        header("Location: $augmentedUrl");

Thank you.