actually we build as3 library for google analytics to simplify the process. open source. http://blog.denivip.ru/index.php/2010/12/open-source-actionscript-3-google-analytics-api/

For Flash
http://www.zedia.net/2009/how-to-connect-to-google-analytics-data-api-in-flash/

Has anyone had any recent success?

I also wanted to use the google analytics data api and arrived to the same conclusion as you and use as3HttpClient lib.

Though, it seems authorization header can be used but solely if the crossdomain file policy of the service include this line :

(cf: http://kb.adobe.com/selfservice/viewContent.do?externalId=kb403184)

A feature request have been filled at Google ( http://groups.google.com/group/Google-Picasa-Data-API/browse_thread/thread/2f1bfab80ea53c60 ). So there is some hope we can use the authorization header directly with urlrequestheader.

thx nakamachi for code helps also ^^.

Example:

var buffer:String = new String();
client.listener.onData = function(event:HttpDataEvent):void {
buffer += event.readUTFBytes();
};
client.listener.onComplete = function(event:HttpResponseEvent):void {
// using Google Anaylitics API response data.
trace(buffer);
};