@Override
  public void onHeaders(Response response) {
    HttpFields headers = response.getHeaders();
    long length = headers.getLongField(HttpHeader.CONTENT_LENGTH.asString());
    if (length > maxLength)
      response.abort(new IllegalArgumentException("Buffering capacity exceeded"));

    String contentType = headers.get(HttpHeader.CONTENT_TYPE);
    if (contentType != null) {
      String charset = "charset=";
      int index = contentType.toLowerCase(Locale.ENGLISH).indexOf(charset);
      if (index > 0) {
        String encoding = contentType.substring(index + charset.length());
        // Sometimes charsets arrive with an ending semicolon
        index = encoding.indexOf(';');
        if (index > 0) encoding = encoding.substring(0, index);
        this.encoding = encoding;
      }
    }
  }