[android-developers] what's wrong with this http post to server code?

I use deflater to compress string data. It works fine on java console project, but while running on android enviroment, server will report "buffer error" problem and reture 500.

SendMessage(String content, String url)

{

byte[] bs = deflaterCompress(content);

URL url = new URL(urlStr);

       HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();

       httpConn.setDoOutput(true);

       httpConn.setRequestMethod("POST");

       httpConn.setDoInput(true);

       

       //httpConn.setRequestProperty("Content-length", String.valueOf(UmengDeviceHelper.TOTAL_LEN));

       httpConn.setRequestProperty("Content-Type", "application/octet-stream");

       httpConn.setRequestProperty("Content-Encoding", "deflate");

       httpConn.connect();

       DataOutputStream outputStream = new DataOutputStream(httpConn.getOutputStream());

       outputStream.write(bs);

       //outputStream.write(content.getBytes("utf-8"));

       outputStream.flush();

       outputStream.close();

       

       int responseCode = 500;

       try {

           responseCode = httpConn.getResponseCode();

           Log.i("MobclickAgent", "reture code is:" + responseCode);

       } catch (NumberFormatException e) {

           // ignore

        e.printStackTrace();

       }

}

public static byte[] deflaterCompress(String str) throws IOException 

{

byte[] input = str.getBytes(encoding);

byte[] output = new byte[100];

Deflater compresser = new Deflater();

compresser.setInput(input);

compresser.finish();

TOTAL_LEN = compresser.deflate(output);

return output;

}

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