/**
   * Generate http request entity from Spring Integration message.
   *
   * @param requestMessage
   * @param method
   * @return
   */
  private HttpEntity<?> generateRequest(Message<?> requestMessage, HttpMethod method) {
    HttpHeaders httpHeaders = new HttpHeaders();
    headerMapper.fromHeaders(requestMessage.getHeaders(), httpHeaders);

    Map<String, ?> messageHeaders = requestMessage.getHeaders();
    for (Entry<String, ?> header : messageHeaders.entrySet()) {
      if (!header.getKey().startsWith(CitrusMessageHeaders.PREFIX)
          && !MessageUtils.isSpringInternalHeader(header.getKey())
          && !httpHeaders.containsKey(header.getKey())) {
        httpHeaders.add(header.getKey(), header.getValue().toString());
      }
    }

    Object payload = requestMessage.getPayload();
    if (httpHeaders.getContentType() == null) {
      httpHeaders.setContentType(
          MediaType.parseMediaType(
              contentType.contains("charset") ? contentType : contentType + ";charset=" + charset));
    }

    if (HttpMethod.POST.equals(method) || HttpMethod.PUT.equals(method)) {
      return new HttpEntity<Object>(payload, httpHeaders);
    }

    return new HttpEntity<Object>(httpHeaders);
  }
  /**
   * Generates the Http response message from given Spring Integration message.
   *
   * @param responseMessage message received from the message handler
   * @return an HTTP entity as response
   */
  private ResponseEntity<String> generateResponse(Message<?> responseMessage) {
    if (responseMessage == null) {
      return new ResponseEntity<String>(HttpStatus.OK);
    }

    HttpHeaders httpHeaders = new HttpHeaders();
    headerMapper.fromHeaders(responseMessage.getHeaders(), httpHeaders);

    Map<String, ?> messageHeaders = responseMessage.getHeaders();
    for (Entry<String, ?> header : messageHeaders.entrySet()) {
      if (!header.getKey().startsWith(CitrusMessageHeaders.PREFIX)
          && !MessageUtils.isSpringInternalHeader(header.getKey())
          && !httpHeaders.containsKey(header.getKey())) {
        httpHeaders.add(header.getKey(), header.getValue().toString());
      }
    }

    if (httpHeaders.getContentType() == null) {
      httpHeaders.setContentType(
          MediaType.parseMediaType(
              contentType.contains("charset") ? contentType : contentType + ";charset=" + charset));
    }

    HttpStatus status = HttpStatus.OK;
    if (responseMessage.getHeaders().containsKey(CitrusHttpMessageHeaders.HTTP_STATUS_CODE)) {
      status =
          HttpStatus.valueOf(
              Integer.valueOf(
                  responseMessage
                      .getHeaders()
                      .get(CitrusHttpMessageHeaders.HTTP_STATUS_CODE)
                      .toString()));
    }

    responseCache =
        new ResponseEntity<String>(responseMessage.getPayload().toString(), httpHeaders, status);

    return responseCache;
  }