$clicker_id = $pathSeg1;
     $last_name = $pathSeg2;
     $output = iclicker_service::ws_go_verify_clickerid($clicker_id, $last_name);
     $cntlr->setContentType("text/plain");
     $cntlr->sendResponse($output);
     return;
     */
 } else {
     // NORMAL case handling
     // handle the request authn if needed
     iclicker_handle_authn($cntlr);
     if ("GET" == $cntlr->method) {
         if ("courses" == $pathSeg0) {
             // handle retrieving the list of courses for an instructor
             $user_id = iclicker_get_and_check_current_user("access instructor courses listings");
             $output = iclicker_service::encode_courses($user_id);
         } else {
             if ("students" == $pathSeg0) {
                 // handle retrieval of the list of students
                 $course_id = $pathSeg1;
                 if ($course_id == null) {
                     throw new InvalidArgumentException("valid course_id must be included in the URL /students/{course_id}");
                 }
                 iclicker_get_and_check_current_user("access student enrollment listings");
                 $output = iclicker_service::encode_enrollments($course_id);
             } else {
                 // UNKNOWN
                 $valid = false;
                 $output = "Unknown path ({$cntlr->path}) specified for method GET";
                 $status = 404;
                 //NOT_FOUND