redirect for login & logout

public/index.php

     addNavbar($response);
     $response->getBody()->write('logged out');
     addFooter($response);
-    return $response;
+    return $response->withHeader('location', '/')->withStatus(302);
 });
 
 $app->map(['GET', 'POST'],'/login', function (Request $request, Response $response, array $args) {
             addNavbar($response);
             $response->getBody()->write('logged in');
             addFooter($response);
-            
+            return $response->withHeader('location', '/')->withStatus(302);            
         } else {
             $response->getBody()->write('username and/or password incorrect');
         }