From 8c31a10d6ea6cbebcbb5c5f4f7c8b42352d424b6 Mon Sep 17 00:00:00 2001
From: Marco Iorio <marco.iorio@polito.it>
Date: Thu, 28 Apr 2022 08:55:29 +0200
Subject: [PATCH] Frontend: configure caching policy in nginx.conf

---
 frontend/nginx.conf.tmpl | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/frontend/nginx.conf.tmpl b/frontend/nginx.conf.tmpl
index a3dfd3c0a..459501472 100644
--- a/frontend/nginx.conf.tmpl
+++ b/frontend/nginx.conf.tmpl
@@ -6,11 +6,32 @@ server {
         root   /usr/share/nginx/html;
         index  index.html;
         try_files $uri ${SUBROUTE}/index.html;
+
+        # Ensure that non-versioned resources are checked
+        # with upstream before using the cached version.
+        add_header Cache-Control 'no-cache must-revalidate';
+        expires 0;
+    }
+
+    location ~ ${SUBROUTE}/favicon.* {
+        root   /usr/share/nginx/html;
+
+        # Allow favicons to be cached, although for shorter periods.
+        add_header Cache-Control 'public';
+        expires 1M;
+    }
+
+    location ${SUBROUTE}/static {
+        root   /usr/share/nginx/html;
+
+        # Allow versioned resources to be cached freely, since a modification
+        # would also change the file name (i.e. they are immutable).
+        add_header Cache-Control 'immutable';
+        expires 1y;
     }
 
     location /healthz {
         access_log off;
         return 200 "healthy\n";
     }
-
 }