code: protected static void populateRequesterPaysHeader(Request<?> request, boolean isRequesterPays) {
          if (isRequesterPays) {
              request.addHeader(Headers.REQUESTER_PAYS_HEADER, Constants.REQUESTER_PAYS);
          }
      }
docs: <p>
  Populate the specified request with {@link Constants#REQUESTER_PAYS} to header {@link Headers#REQUESTER_PAYS_HEADER},
  if isRequesterPays is true.
  </p>
  
  @param request
  The specified request to populate.
  @param isRequesterPays
  The flag whether to populate the header or not.