From 0f1dd9c9525203c7c4fe682f4ce99942344e193b Mon Sep 17 00:00:00 2001
From: Grant Slater <git@firefishy.com>
Date: Sun, 8 Dec 2019 18:52:13 +0000
Subject: [PATCH] tilecache: use conditional validation upstream

---
 cookbooks/tilecache/templates/default/nginx_tile.conf.erb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/cookbooks/tilecache/templates/default/nginx_tile.conf.erb b/cookbooks/tilecache/templates/default/nginx_tile.conf.erb
index 07bf8fcd9..6895ea54c 100644
--- a/cookbooks/tilecache/templates/default/nginx_tile.conf.erb
+++ b/cookbooks/tilecache/templates/default/nginx_tile.conf.erb
@@ -225,9 +225,11 @@ server {
       proxy_cache_use_stale error timeout updating http_500 http_503 http_504;
       # If in cache as stale, serve stale and update in background
       proxy_cache_background_update on;
+      # Enable revalidation using If-Modified-Since and If-None-Match for stale items
+      proxy_cache_revalidate on;
       proxy_cache_min_uses 8;
 
-      add_header X-Nginx-Cache-Status $upstream_cache_status;
+      add_header x-cache-status $upstream_cache_status;
 <% end -%>
 
       # Set a QoS cookie if none presented (uses nginx Map)
-- 
2.43.2