nginx_status - ＆gt;例外：服务器localhost不负责任

Question

在我的项目中使用：Java6，Struts 1，JSP。

在some.jsp页面中有几行代码：

try {               
ExecutorService exService = Executors.newSingleThreadExecutor();
FutureTask task = new FutureTask(new Callable() {
  public String call() throws Exception {
    String rez = org.apache.commons.io.IOUtils.toString((
      new java.net.URL("http://" + server + ":8080/nginx_status")).openStream());
    return rez;
        }
    });
 exService.execute(task);
 String rez = (String) task.get(300, TimeUnit.MILLISECONDS);
 if (rez == null) System.out.println("Server " + server + " is not responsible in 300 ms");
 System.out.println("Server " + server + " status: " +rez);
} catch (Exception ex) {
 System.out.println("Server " + server + " is not responsible");
    }
   }    
} catch (Exception ex) {
System.out.print("Status information: cannot find servers adress");
}

执行代码后，在控制台上显示以下代码行：

  

服务器localhost不负责

可能是什么问题？