Applet HttpUrlConnection Chunked Response problem

Question

I have an Applet with HttpUrlConnection to IIS 6.0 Server. Server response chunked data, but sometimes (some browsers) i have a problem. Server answers stick in certain buffer, and arrive at me when the server close connection by timeout.

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();
}

certain browser buffer, i don't know. At this moment IIS already send answers, this is client problem, IE7, java 1.6.0_16

Any ideas ?

Answer 1

In readLine() you seem to be doing something strange.

When read==-1 (which means end of stream) you are waiting for 150 secondes before setting errorConnection=true which allows readLine and subsequently readData and the while (!errorConnection & !trunkStop) { readData(); } to stop.

These 150 secondes could be longer than the connection timeout of the IIS server.

---

Btw. you are using the bit-wise and operator (&) instead of the logical and operator (&&) are you sure that's what you want? Check the difference.

& java bit-wise and operator

&& java McCarthy and operator

Answer 2

problem is solved!

The client uses a proxy. HTTPS using helped