Note about Vaadin-Refresh

articles/flow/advanced/modifying-the-bootstrap-page.adoc

@@ -202,6 +202,20 @@ public class AppShell implements AppShellConfigurator {
 
 Modifications in [methodname]`AppShellConfigurator.configurePage()` have priority over the equivalent annotations. Annotations don't cover all of the cases that can be achieved when overriding the [methodname]`AppShellConfigurator.configurePage()` method.
 
+==== Forcing a Page Reload After an Invalid Server Response[[vaadin-refresh]]
+
+If the XHR response can't be parsed as JSON, Vaadin looks for a “Vaadin-Refresh” string anywhere inside the response text. If it's present, Vaadin reloads the page instead of showing an error message. You can add the refresh token as a meta tag.
+
+[source,java]
+----
+public class AppShell implements AppShellConfigurator {
+
+  @Override
+  public void configurePage(AppShellSettings settings) {    
+    settings.addMetaTag("refresh", "Vaadin-Refresh");
+  }
+}
+----
 
 === `IndexHtmlRequestListener` Interface [[IndexHtmlRequestListener-interface]]