用flash socket发送http请求

package {
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.IOErrorEvent;
    import flash.events.ProgressEvent;
    import flash.net.Socket;
    import flash.system.Security;
    public class MySock extends Sprite
    {
        public var port:int = 80;
        public var host:String = "127.0.0.1";
        public var sock:Socket;
        public var response:String;
        public function MySock()
        {
            sock = new Socket();
            sock.addEventListener(Event.CONNECT,connect);
            sock.addEventListener(Event.CLOSE,close);
            sock.addEventListener(ProgressEvent.SOCKET_DATA,dataHandler);
            sock.addEventListener(Event.COMPLETE,dataOk);
            Security.loadPolicyFile("http://"+host+":"+port+"/crossdomain.xml");  
            
            sock.addEventListener(IOErrorEvent.IO_ERROR,function(e:IOErrorEvent):void{trace("ioerr");});
            start();
        }
        //这里是收不到数据的
        public function dataOk(e:Event):void
        {
            trace("dataok:"+e.target.data);
        }
        public function close(e:Event):void
        {
            trace("关闭了！");
        }
        
        public function connect(e:Event):void
        {
            trace("连接成功！");
            var header:String = "GET /crossdomain.xml HTTP/1.1 rn";
            header += "Accept: */* rn"
            header += "Accept-Language: zh-cn rn";
            header += "UA-CPU: x86 rn";
            header += "Accept-Encoding: gzip, deflate rn";
            header += "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ) rn";
            header += "Host: " + host + ":" + port + " rn";
            header += "Connection: Keep-Alive rn";
            header += "Cache-Control: no-cache rnrn";
            
            sock.writeUTFBytes(header);
            
            sock.flush();
        }
        //收到数据
        public function dataHandler(e:ProgressEvent):void
        {
            trace("dataHandler:"+e.bytesLoaded);
            var str:String = sock.readUTFBytes(sock.bytesAvailable);
            response += str;
            
            //if(e.bytesLoaded == e.bytesTotal)
            trace("response->"+response);
        }
        public function start():void
        {
            sock.connect(host,port);
        }
    }
}