return charset;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.client.CrawlerClient#doHead(java.lang.String)
     */
    @Override
    public ResponseData doHead(final String url) {
        try {
            final ResponseData responseData = processRequest(url, false);
            responseData.setMethod(Constants.HEAD_METHOD);

        return processRequest(uri, true);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.client.CrawlerClient#doHead(java.lang.String)
     */
    @Override
    public ResponseData doHead(final String url) {
        try {
            final ResponseData responseData = processRequest(url, false);
            responseData.setMethod(Constants.HEAD_METHOD);

        this.charset = charset;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.robot.client.S2RobotClient#doHead(java.lang.String)
     */
    @Override
    public ResponseData doHead(final String url) {
        try {
            final ResponseData responseData = processRequest(url, false);
            responseData.setMethod(Constants.HEAD_METHOD);

        }
        return doHttpMethod(url, httpGet);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.http.HttpClient#doHead(java.lang.String)
     */
    @Override
    public ResponseData doHead(final String url) {
        HttpUriRequest httpHead;
        try {
            httpHead = new HttpHead(url);
        } catch (final IllegalArgumentException e) {

				currentPartBytes := v - partOffset
				currentPartDareBytes := v - partDarePkgOffset
				if currentPartBytes < toRead {
					toRead -= currentPartBytes
					l += getEncSize(currentPartDareBytes)
				} else {
					// current part has the last
					// byte required
					lbPartOffset := partOffset + toRead - 1

					// round up the lbPartOffset
					// to the end of the
					// corresponding DARE package

    protected HashMap response_map = new HashMap( 4 );

    protected abstract void makeKey( Request request ) throws IOException;
    protected abstract Request peekKey() throws IOException;
    protected abstract void doSend( Request request ) throws IOException;
    protected abstract void doRecv( Response response ) throws IOException;
    protected abstract void doSkip() throws IOException;

    public synchronized void sendrecv( Request request,

     * @param timeout
     * @return
     * @throws IOException
     */
    protected <T extends Response> long doSend ( Request request, T response, Set<RequestParam> params, long timeout ) throws IOException {
        long firstKey = prepareRequests(request, response, params, timeout);
        doSend(request);
        return firstKey;
    }


    /**
     * @param request
     * @param response

   *
   * @return the source of this event.
   */
  public Object getSource() {
    return source;
  }

  /**
   * Returns the wrapped, 'dead' event, which the system was unable to deliver to any registered
   * subscriber.
   *
   * @return the 'dead' event that could not be delivered.
   */
  public Object getEvent() {
    return event;
  }

  @Override
  public String toString() {

            json={
                "id": 9000,
                "name": "Dead Pond",
                "age": 30,
                "secret_name": "Dive Wilson",
            },
        )
        assert response.status_code == 200, response.text
        assert response.json() == snapshot(
            {"age": 30, "id": IsInt(), "name": "Dead Pond"}
        )
        assert (
            response.json()["id"] != 9000

      source: Buffer,
      byteCount: Long,
    ) {
      val toRead = minOf(remainingByteCount, byteCount)
      if (toRead > 0L) {
        source.read(buffer, toRead)
      }
      val toSkip = byteCount - toRead
      if (toSkip > 0L) {
        source.skip(toSkip)
      }
      remainingByteCount -= toRead
      receivedByteCount += byteCount
    }

    @Throws(IOException::class)