public void appendHead(Response res) throws IOException {
    if (log.isDebugEnabled())
      log.debug("COMMIT sending headers " + res + " " + res.getMimeHeaders());

    C2BConverter c2b = mc.getConverter();

    outputMsg.reset();
    outputMsg.appendByte(AjpConstants.JK_AJP13_SEND_HEADERS);
    outputMsg.appendInt(res.getStatus());

    String message = null;
    if (org.apache.coyote.Constants.USE_CUSTOM_STATUS_MSG_IN_HEADER
        && HttpMessages.isSafeInHttpHeader(res.getMessage())) {
      message = res.getMessage();
    }
    if (message == null) {
      message = HttpMessages.getMessage(res.getStatus());
    }
    if (message == null) {
      // mod_jk + httpd 2.x fails with a null status message - bug 45026
      message = Integer.toString(res.getStatus());
    }
    tempMB.setString(message);
    c2b.convert(tempMB);
    outputMsg.appendBytes(tempMB);

    // XXX add headers

    MimeHeaders headers = res.getMimeHeaders();
    String contentType = res.getContentType();
    if (contentType != null) {
      headers.setValue("Content-Type").setString(contentType);
    }
    String contentLanguage = res.getContentLanguage();
    if (contentLanguage != null) {
      headers.setValue("Content-Language").setString(contentLanguage);
    }
    long contentLength = res.getContentLengthLong();
    if (contentLength >= 0) {
      headers.setValue("Content-Length").setLong(contentLength);
    }
    int numHeaders = headers.size();
    outputMsg.appendInt(numHeaders);
    for (int i = 0; i < numHeaders; i++) {
      MessageBytes hN = headers.getName(i);
      // no header to sc conversion - there's little benefit
      // on this direction
      outputMsg.appendBytes(hN);

      MessageBytes hV = headers.getValue(i);
      outputMsg.appendBytes(hV);
    }
    mc.getSource().send(outputMsg, mc);
  }
  /**
   * Get more request body data from the web server and store it in the internal buffer.
   *
   * @return true if there is more data, false if not.
   */
  private boolean refillReadBuffer() throws IOException {
    // If the server returns an empty packet, assume that that end of
    // the stream has been reached (yuck -- fix protocol??).
    if (isReplay) {
      end_of_stream = true; // we've read everything there is
    }
    if (end_of_stream) {
      if (log.isDebugEnabled()) log.debug("refillReadBuffer: end of stream ");
      return false;
    }

    // Why not use outBuf??
    bodyMsg.reset();
    bodyMsg.appendByte(AjpConstants.JK_AJP13_GET_BODY_CHUNK);
    // Adjust allowed size if packetSize != default (AjpConstants.MAX_PACKET_SIZE)
    bodyMsg.appendInt(AjpConstants.MAX_READ_SIZE + packetSize - AjpConstants.MAX_PACKET_SIZE);

    if (log.isDebugEnabled()) log.debug("refillReadBuffer " + Thread.currentThread());

    mc.getSource().send(bodyMsg, mc);
    mc.getSource().flush(bodyMsg, mc); // Server needs to get it

    // In JNI mode, response will be in bodyMsg. In TCP mode, response need to be
    // read

    boolean moreData = receive();
    if (!moreData) {
      end_of_stream = true;
    }
    return moreData;
  }