Main.as

package {

import flash.display.Sprite;
import flash.events.LocationChangeEvent;
import flash.geom.Rectangle;
import flash.media.StageWebView;

public class Main extends Sprite {

    private static const CAPTCHA_ENDPOINT : String = "https://www.habbo" + ".com/api/public/captcha";
    //private static const CAPTCHA_ENDPOINT : String = "https://www.google.com";
    private static const TOKEN_KEY : String = "token=";

    public function Main() {
        var webView : StageWebView = new StageWebView(true, false); // also fails with false
        // [trace] SyntaxError: Parse error
        // [trace] https://www.gstatic.com/recaptcha/releases/bfvuz6tShG5aoZp4K4zPVf5t/recaptcha__en.js : 14
        webView.stage = this.stage;
        webView.viewPort = new Rectangle(0, 0, 500, 500);
        webView.loadURL(CAPTCHA_ENDPOINT);
        webView.addEventListener(LocationChangeEvent.LOCATION_CHANGE, onLocationChange);
    }

    private function onLocationChange(e:LocationChangeEvent):void {
        var token : String = resolveToken(e.location);
        if (token != null){
            //handleCaptchaResult(token);
        }
    }

    private static function resolveToken(location:String):String {
        var tokenIndex:int = location != null ? location.indexOf(TOKEN_KEY) : -1;
        if (tokenIndex < 0) {
            return null;
        }
        return location.substr(tokenIndex + TOKEN_KEY.length);
    }

}
}