无法从我的模拟器连接到我的服务器

Question

我正在尝试从我的Android应用程序连接到我的vagrant服务器。当我运行此代码时：

 try {
            //Build the connection
            URL url = new URL("http://10.0.2.2:8000/test");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("POST");
            connection.setReadTimeout(10000);
            connection.setConnectTimeout(15000);
            connection.setDoInput(true);
            connection.setDoOutput(true);



            HashMap<String, String> postDataParams = new HashMap<String, String>();
            postDataParams.put("param1", "2");
            postDataParams.put("param2", "4567");
            postDataParams.put("param3");

            OutputStream os = connection.getOutputStream();
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(os, "UTF-8"));
            writer.write(getPostDataString(postDataParams));
            writer.flush();
            writer.close();
            os.close();
            connection.connect();
            Integer responsecode = connection.getResponseCode();


            String message = "The Response Was: " + Integer.toString(responsecode);
            Log.d("MainActivity", message);
            Log.d("MainActivity", connection.getResponseMessage());
            //Is dit nodig???
            //con.setRequestProperty("User-Agent", USER_AGENT);


        } catch (IOException e) {
            String msg = (e.getMessage()==null)?"Geen message!":e.getMessage();
            Log.i("Error",msg);
        }
    }

我得到404作为回复。但是，当我从我的模拟器启动浏览器并转到我得到我想要的页面时。

我怎么解决这个问题？