code: public static boolean shouldGzippedBodyBeZero(byte[] compressedBytes, HttpServletRequest request) {
  
  		//Check for 0 length body
  		if (compressedBytes.length == EMPTY_GZIPPED_CONTENT_SIZE) {
  			if (log.isTraceEnabled()) {
  				log.trace("{} resulted in an empty response.", request.getRequestURL());
  			}
  			return true;
  		} else {
  			return false;
  		}
  	}
docs: Checks whether a gzipped body is actually empty and should just be zero. When the compressedBytes is
  {@link #EMPTY_GZIPPED_CONTENT_SIZE} it should be zero.
  @param compressedBytes the gzipped response body
  @param request the client HTTP request
  @return true if the response should be 0, even if it is isn't.