HttpURLConnection碰到连续302跳转的问题的原因及解决方法

用HttpURLConnection联网的代码：

HttpURLConnection conn = null;
       URL url = new URL("http://10.0.0.172/");
       conn = (HttpURLConnection) url.openConnection();       conn .setRequestMethod("POST");
       conn .setDoInput(true);
       conn .setDoOutput(true);
       conn.setRequestProperty("X-Online-Host","www.xxxx.com");       conn.setConnectTimeout(30000); // 30秒超时
       conn.connect();

setFollowRedirects关掉自动重定向，还是connection reset. 查了很长时间，还是弄不出个所以然来，看HttpURLConnection 的实现代码，redirect大于4次才会抛出一个Too many redirects 的异常，这才两个302就挂了...最后换用org.apache.http包里的东西，就没有问题。

 

DefaultHttpClient httpClient = new DefaultHttpClient();
  HttpHost proxy = new HttpHost("10.0.0.172", 80);
   httpClient.getParams().setParameter(ConnRouteParams.DEFAULT_PROXY,proxy);
   HttpConnectionParams.setConnectionTimeout(httpClient.getParams(),20 * 1000);
   HttpConnectionParams.setSoTimeout(httpClient.getParams(), 20 * 1000);
   HttpGet httpget = new HttpGet(theurl);
   HttpResponse response = httpClient.execute(httpget);

无论是自动跳转还是手动处理跳转都没有问题。