PlayN.Net returning empty String in HTML

I can't understand the problem im having with PlayN.net. Maybe it's trivial, but since im new to web based stuff, I'm kinda stuck, so I hope someone here can enlighten me :)

My problem: I would like to acess a servlet from my game, it works, but only in java. Html gives me back an empty string.

Simple Servlet:

public class Servlet1 extends HttpServlet {
   protected void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException
   {
      PrintWriter writer = response.getWriter();
      writer.println("test");
      writer.close();
   }
}

and simple call:

PlayN.net().get("http://localhost:8080/Test", new Callback<String>() {
            @Override
            public void onSuccess(String result) {
                System.out.println("YAY "+result);
            }
            @Override
            public void onFailure(Throwable cause) {
                System.out.println("BUH");
            }
        });

So like I said, java prints "YAY test", HTML prints "YAY" and I cannot figure out why. I tried running the servlet on an other server (not localhost) but the same reaction.

Anyone an idea what I'm doing wrong?

Solution

In the browser (HTML) you have to work with the 'Same origin policy': See http://en.wikipedia.org/wiki/Same_origin_policy