Apache HttpClient：为NoRouteToHostException设置超时

Question

我使用的是Apache HttpClient 4.2.5，需要设置连接超时30秒。我做了以下事情：

int timeout = 30 * 1000;
HttpParams params = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(params, timeout);
HttpConnectionParams.setSoTimeout(params, timeout);
HttpClient client = new DefaultHttpClient(params);

HttpGet request = new HttpGet(url.toURI());
client.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, timeout);
client.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, timeout);
HttpResponse response = client.execute(request);

但是12秒后，从client.execute（请求）抛出NoRouteToHostException。据我所知，CONNECTION_TIMEOUT和SO_TIMEOUT在这里毫无用处。你有什么想法，如何为NoRouteToHostException设置超时？我希望服务器在这段时间内可用。感谢您的任何评论和建议！