public HttpResponseMessage progressReportCSV(Guid orgId, Guid projId, Guid? locId) {
DateTime? startDate = grabStartDate();
DateTime? endDate = grabEndDate();
var response = csvStream("progress.csv", new PushStreamContent((stream, Content, context) => {
var writer = new StreamWriter(stream);
ProgressReport.buildCSV(writer, orgId, projId, locId, startDate, endDate);
}));
return response;
} // progressReportCSV
