protected long copy(InputStream is, OutputStream os) throws IOException {
    long bytesWritten = 0;
    byte[] buffer = new byte[1024 * 10];
    int bytesRead = 0;
    while ((bytesRead = is.read(buffer)) > 0) {
        if (bytesRead > 0) os.write(buffer, 0, bytesRead);
        bytesWritten += bytesRead;
    }
    return bytesWritten;
}