public Response getJSON(
@QueryParam("pgIdx") Integer pgIdx,
@QueryParam("pgNum") Integer pgNum,
@QueryParam("pgSze") Integer pgSze) {
PagingRequest pr = buildPagingRequest(pgIdx, pgNum, pgSze);
ExchangeHistoryRequest request = new ExchangeHistoryRequest(data().getExchange().getUniqueId());
request.setPagingRequest(pr);
ExchangeHistoryResult result = data().getExchangeMaster().history(request);
FlexiBean out = createRootData();
out.put("versionsResult", result);
out.put("versions", result.getExchanges());