/**
   * bca text dari input stream, dan convert menjadi string object
   *
   * @throws IOException
   */
  private String readStream(InputStream stream, int maxLength) throws IOException {
    String result = null;
    // Read InputStream using the UTF-8 charset.
    InputStreamReader reader = new InputStreamReader(stream, "UTF-8");
    // Create temporary buffer to hold Stream data with specified max length.
    char[] buffer = new char[maxLength];
    // Populate temporary buffer with Stream data.
    int numChars = 0;
    int readSize = 0;
    while (numChars < maxLength && readSize != -1) {
      numChars += readSize;
      readSize = reader.read(buffer, numChars, buffer.length - numChars);
    }
    if (numChars != -1) {
      // The stream was not empty.
      // Create String that is actual length of response body if actual length was less than
      // max length.
      numChars = Math.min(numChars, maxLength);
      result = new String(buffer, 0, numChars);
    }
    return result;
  }