android 使用 模拟浏览器，无法得到返回值

代码如下，根据输入的url地址来返回状态码。
可是，httpconnection.getResponseCode();返回的都是200，没有实际返回访问值。
请高手指点。

public String stat_is(String strurl)
{

     HttpURLConnection  httpconnection;
     int rcode=0;
    String respon = "ok";
    httpconnection = null;
    //String strurl=siteaddr;


    try{

        URL url = new URL(strurl);
        httpconnection = (HttpURLConnection) url.openConnection(); 

        httpconnection.setConnectTimeout(2*1000);
        httpconnection.setRequestMethod("GET");
        httpconnection.setDoInput(true);    

        httpconnection.setRequestProperty("Charset", "UTF-8");
        httpconnection.setUseCaches(false); 
        httpconnection.setRequestProperty("Connection", "Keep-Alive");  
        //httpconnection.setRequestProperty("Content-type", "application/x-java-serialized-object");   
        //InputStream input = httpconnection.getInputStream();
        //readStream(input);
        //httpconnection.setRequestProperty("Content-Type", "application/xhtml+xml");
        //mes = httpconnection.getResponseMessage();
        httpconnection.connect();
        rcode = httpconnection.getResponseCode();
        if (rcode == 200){
            respon="ok";
        }
        else 
        {
            respon="error";
        }


    }
    catch (Exception e) {  
           e.printStackTrace();  

               }
    finally {   
              if (httpconnection != null) {   
                    httpconnection.disconnect();   
             }   

    }


    return respon;  

}

200 （成功） 表示服务器已成功处理了请求。 通常，这表示服务器提供了请求的网页。
然后，要去读数据流，如下代码：

  URL url = new URL("http://www.sohu.com");
 HttpURLConnection conn = (HttpURLConnection) url.openConnection();
 conn.setConnectTimeout(6* 1000);//设置连接超时
 if (conn.getResponseCode() != 200) 
     throw new RuntimeException("请求url失败");
 InputStream is = conn.getInputStream();//得到网络返回的输入流
 String result = readData(is, "GBK");
 conn.disconnect();
 System.out.println(result);
  //第一个参数为输入流,第二个参数为字符集编码
    public static String readData(InputStream inSream, String charsetName) throws Exception{
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = -1;
        while( (len = inSream.read(buffer)) != -1 ){
            outStream.write(buffer, 0, len);
        }
        byte[] data = outStream.toByteArray();
        outStream.close();
        inSream.close();
        return new String(data, charsetName);
    }