tilecache: use conditional validation upstream

diff --git a/cookbooks/tilecache/templates/default/nginx_tile.conf.erb b/cookbooks/tilecache/templates/default/nginx_tile.conf.erb
index 07bf8fcd9516760022e53ed8c6288785bddc0a89..6895ea54cccf57528290f283036f7ffd3b06facb 100644 (file)
--- 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)