应该如何查看获取JSON字符串的URL

Question

为什么对于第一个String，“jsonGetMethod”方法有效，但是使用第二个和第三个字符串 - 不是吗？当我从Android Web浏览器中的所有字符串输入URL时 - 我看到了json响应。 （我正在使用通过Wi-Fi连接到互联网的Eclipse，Real Android Device（非模拟器），在AndroidManifest Internet Permission中添加。）

    //This String works fine
    private static String url = "http://json-ld.org/contexts/person.jsonld";

    //Log.d(jsonStr) shows "null"
    private static String url = "http://192.168.1.200:8080/test/json";

    //Exception throws
    private static String url = "192.168.1.200:8080/test/json";

    public String jsonGetMethod(String url) 
    {
        try {

          DefaultHttpClient httpClient = new DefaultHttpClient();
          HttpEntity httpEntity = null;
          HttpResponse httpResponse = null;

          HttpGet httpGet = new HttpGet(url);
          httpResponse = httpClient.execute(httpGet);


          httpEntity = httpResponse.getEntity();
          response = EntityUtils.toString(httpEntity);

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return response;
}

String jsonStr = jsonGetMethod(url);
Log.d(jsonStr);