How can I send custom headers using URLRequest

Question

I want to add an authorization header to my requests. I added the following line to the crossdomain.xml server:

<allow-http-request-headers-from domain="*" headers="Authorization"/>

Still, the header is not sent (tagged with Wireshark).

Am I missing something?

EDIT:

urlRequest code:

var request:URLRequest = new URLRequest();
request.method = URLRequestMethod.POST;
request.url = this.uploadURL;
request.data = post;

var requestHeader:URLRequestHeader = new URLRequestHeader("Authorization", "Basic ZXNhcGlyK2xhQGdtYWlsLmNvbTpFcmlrU2FwaXIyOQ==");                   


request.requestHeaders.push(requestHeader);

Answer 1

Here is an implementation I recently made that worked great for me:

var url:String = _baseURL + "/utils.php";

var headers:Array = [
    new URLRequestHeader("_sessionKey", _sessionKey),
    new URLRequestHeader("_userId", _sessionUserId)
];

var request:URLRequest = new URLRequest();
request.requestHeaders = headers;
request.method = URLRequestMethod.POST;
request.url = url;

/////////////////// 

var loader:URLLoader = new URLLoader();
loader.dataFormat = URLLoaderDataFormat.TEXT; //don't know if this is really needed 
loader.addEventListener(Event.COMPLETE, handleSuccess);
loader.addEventListener(IOErrorEvent.IO_ERROR, handleError);
loader.addEventListener(SecurityErrorEvent.SECURITY_ERROR, handleError);

loader.load(request);

, , , , requestHeaders request , URLRequestHeader request.requestHeaders. .

, ! !