Minimal caching

Author: vmcj

webapp/src/Controller/PublicController.php

@@ -101,10 +101,15 @@ public function scoreboardDataZipAction(
     }
 
     #[Route(path: '/scoreboard-category-color.css', name: 'scoreboard_category_color_css')]
-    public function scoreboardCategoryColorCss(): Response {
+    public function scoreboardCategoryColorCss(Request $request): Response {
+        $content = $this->renderView('public/scoreboard_category_color.css.twig', $this->dj->getScoreboardCategoryColorCss());
         $response = new Response();
         $response->headers->set('Content-Type', 'text/css');
-        $response->setContent($this->renderView('public/scoreboard_category_color.css.twig', $this->dj->getScoreboardCategoryColorCss()));
+        // See: https://symfony.com/doc/current/http_cache/validation.html
+        $response->setEtag(md5($content));
+        $response->setPublic();
+        $response->isNotModified($request);
+        $response->setContent($content);
         return $response;
     }