docs: protected boolean hasContentType() {
  
          boolean result = false;
          if(this.request.getHeader(RestMessageHeaders.CONTENT_TYPE) != null) {
              result = true;
          } else {
              logger.error("Error when validating put request. Missing Content-Type header.");
              RestErrorHandler.writeErrorResponse(this.messageEvent,
                                                  HttpResponseStatus.BAD_REQUEST,
                                                  "Missing Content-Type header");
          }
          return result;
      }