A utilitary function to handle authenticated sessions when using URLRequests in ActionScript. Just reads the JSessionId from the user cookie and appends it to the URI.

AuthenticatedUrlRequestUtil.as

/**
* Build the URL to call with the session ID
*/
public static function buildAuthenticatedURL(url : String):String
{
    if (jsessionid == null) {
 
        // Get the cookie
        ExternalInterface.call('eval','window.getCookie = function () {return document.cookie};');
        var cookie : String = ExternalInterface.call('getCookie');
 
        // Extract the JSESSIONID value
        var regexp : RegExp = new RegExp("JSESSIONID=([\\d\\w]*)","ig");
        cookie = cookie.match(regexp)[0];
        var jsessionid : String = cookie.split("=")[1];
    }
    return url + ";jsessionid=" + jsessionid;
}