code: @Override
  	public Map<String, String> getHttpHeaders() {
  		// revisit record had no HTTP headers in early days.
  		if (headersResource.getRecordLength() == 0)
  			return payloadResource.getHttpHeaders();
  		else
  			return headersResource.getHttpHeaders();
  	}
docs: /* (non-Javadoc)
  @see org.archive.wayback.core.Resource#getHttpHeaders()