Index: lams_gradebook/web/WEB-INF/web.xml
===================================================================
diff -u -rf5c1bfbe0683f40cf0e36a668d3ef2f2986a0ae8 -r52b0be8aff9fda9efc23ac346b96786dfb10f9c1
--- lams_gradebook/web/WEB-INF/web.xml	(.../web.xml)	(revision f5c1bfbe0683f40cf0e36a668d3ef2f2986a0ae8)
+++ lams_gradebook/web/WEB-INF/web.xml	(.../web.xml)	(revision 52b0be8aff9fda9efc23ac346b96786dfb10f9c1)
@@ -101,6 +101,7 @@
 			org.springframework.web.servlet.DispatcherServlet
 		</servlet-class>
 		<load-on-startup>1</load-on-startup>
+		<async-supported>true</async-supported>
 		<multipart-config/>
 	</servlet>