@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String testId = req.getParameter("testId");
ChartType type = ChartType.valueOf(req.getParameter("type"));
Rollup rollup = Rollup.valueOf(req.getParameter("rollup"));
List<String> args = new ArrayList<String>();
int i = 1;
while (true) {
String arg = req.getParameter("arg" + i);
if (arg == null) {