一个http请求二次请求才能获取到数据，为什么，url的问题？

public static void t(String[] args) throws ClientProtocolException, IOException, InterruptedException{
HttpClient httpClient=new DefaultHttpClient();
HttpPost httpPost=new HttpPost("http://172.19.10.137:8601/bjt1deea3e3e7fb/js/data/user_info.json");
List<NameValuePair>params=new ArrayList<NameValuePair>();

params.add(new BasicNameValuePair("codeType","bno"));

params.add(new BasicNameValuePair("userNumber","B23871039"));
params.add(new BasicNameValuePair("business","data"));

UrlEncodedFormEntity entity=new UrlEncodedFormEntity(params,"utf-8");
httpPost.setEntity(entity);
HttpResponse httpResponse1 =httpClient.execute(httpPost);
//释放  不知道为什么不释放一次取不到返回
httpPost.releaseConnection();
HttpResponse httpResponse =httpClient.execute(httpPost);
if(httpResponse.getStatusLine().getStatusCode()==200){

//请求和响应都成功了

HttpEntity rentity=httpResponse.getEntity();//调用getEntity()方法获取到一个HttpEntity实例

String response=EntityUtils.toString(rentity,"utf-8");//用EntityUtils.toString()这个静态方法将HttpEntity转换成字符串,防止服务器返回的数据带有中文,所以在转换的时候将字符集指定成utf-8就可以了
System.out.println("-------------------------------------");
System.out.println(response);
}
}