applet httpurlconnection chunked响应问题

我有一个与IIS6.0服务器有httpurlConnection的小程序。 服务器响应分块数据,但有时(某些浏览器)我有问题。 服务器应答卡在一定的缓冲区中,当服务器超时关闭连接时到达我。

url = new URL(urlStr); 
huc = (HttpURLConnection) url.openConnection();
huc.setDefaultUseCaches(false); 
huc.setAllowUserInteraction(true);
huc.setDoInput(true);
huc.setUseCaches(false);
huc.setRequestProperty("Pragma", "no-cache");
huc.setRequestProperty("Cache-Control", "no-cache");
huc.setRequestProperty("Expires", "-1");
huc.setRequestProperty("Content-type", "text/html");
InputStream is = huc.getInputStream();
... 
while (!trunkStop) {
  while (errorConnection && !trunkStop) {
    connectToServer();
     if (errorConnection) {
       sleepThread();
     }
  }

  while (!errorConnection && !trunkStop) {
            readData();
  }
 ...
}
...
void readData() {
    if (trunkStop) {
        return;
    }
    try {
        readLine();
        addTask();//put to task queue
    } catch (Exception e) {
        getLogger().log(Level.WARNING, "Error connection...");
    }
}
...
String readLine() throws IOException, InterruptedException {
    sb = new StringBuilder();
    int prev = -1;
    while (!errorConnection && !trunkStop) {
        read = is.read();
        if (read == -1) {
            if (System.currentTimeMillis() - timer > 150000) {
                getLogger().log(Level.SEVERE, "RECONNECT BY TIMEOUT");
                errorConnection = true;
            }
            Thread.sleep(10);
            continue;
        } else if (read == 13) {

        } else if (read == 10 && prev == 13) {
            break;
        } else {
            sb.append((char) read);
            System.out.print((char) read);
        }
        prev = read;
        timer = System.currentTimeMillis();
    }
    return sb.toString();
}

某些浏览器缓冲区,我不知道。 此时,IIS已经发送了答案,这是客户端问题, IE7,Java1.60EY16

有什么想法吗?