Copy passed parameters into the service call #4278

@@ -143,6 +143,15 @@ public class DirectControlServlet extends HttpServlet {
                     context.put(key, items.get(key));
                 }
             } else if ("text/csv".equals(contentType)) {
+                // Directly copy request parameters into context.
+                for (Enumeration<String> params = request.getParameterNames(); params.hasMoreElements();) {
+                    String param = params.nextElement();
+                    Object[] values = request.getParameterValues(param);
+                    if (!"sessionId".equals(param) && !"_method".equals(param)) {
+                        context.put(param, values.length == 1 ? values[0] : values);
+                    }
+                }
+
                 Iterable<CSVRecord> records = CSVFormat.EXCEL.parse(request.getReader());
                 List data = new ArrayList();
                 for (CSVRecord record : records) {