HttpClient SockettTimeoutException处理

我从中获取数据 REST API server 使用 HttpClient 。
现在,当我在10秒内无法从 API Server 。
所以我就这样做了

HttpClient httpClient = new DefaultHttpClient();

HttpParams httpParams = httpClient.getParams();
HttpConnectionParams.setConnectionTimeout(httpParams, 10000);
HttpConnectionParams.setSoTimeout(httpParams, 10000);

HttpPost httpPost = new HttpPost("api server address");
httpPost.setParams(...);

HttpResponse response;
try{
    response = httpClient.execute(httpPost);    
} catch(SocketTimeoutException e){
    httpPost.setParams(...); // change param
    response = httpClient.execute(httpPost);
}

事情发生的样子
invalid use of singleclientconnmanager: connection still allocated.
这很有道理,但我不知道如何处理。