X-Git-Url: https://git.openstreetmap.org./chef.git/blobdiff_plain/24641ab27b9cb1a72a8207a58142b500b0279f58..41487eea939ced6fb053fac4f68f77a314e4dfa5:/cookbooks/imagery/templates/default/nginx_imagery_layer_fragment.conf.erb

diff --git a/cookbooks/imagery/templates/default/nginx_imagery_layer_fragment.conf.erb b/cookbooks/imagery/templates/default/nginx_imagery_layer_fragment.conf.erb
index 856ec6765..372bf0e56 100644
--- a/cookbooks/imagery/templates/default/nginx_imagery_layer_fragment.conf.erb
+++ b/cookbooks/imagery/templates/default/nginx_imagery_layer_fragment.conf.erb
@@ -4,6 +4,7 @@ location ~* "^/layer/<%= @layer %>/(\d+)/(\d+)/(\d+)\.(png|jpg|jpeg)$" {
   fastcgi_param QUERY_STRING "map=/srv/imagery/mapserver/layer-<%= @layer %>.map&mode=tile&layers=<%= @layer %>&tilemode=gmap&tile=$2+$3+$1";
   fastcgi_pass "<%= @site %>_fastcgi";
   fastcgi_buffers 8 64k;
+  fastcgi_busy_buffers_size 64k;
   include fastcgi_params;
   fastcgi_param REQUEST_METHOD "GET";
   fastcgi_param HTTP_PROXY "";
@@ -16,10 +17,16 @@ location ~* "^/layer/<%= @layer %>/(\d+)/(\d+)/(\d+)\.(png|jpg|jpeg)$" {
   # Free connection to socket for other requests
   fastcgi_keep_conn off;
 
-  fastcgi_cache_lock on;
-  fastcgi_cache_lock_timeout 30s;
   fastcgi_cache_valid 200 21d;
+
+  # Serve stale cache on errors or if updating
   fastcgi_cache_use_stale error timeout updating http_500 http_503;
+  # If in cache as stale, serve stale and update in background
+  fastcgi_cache_background_update on;
+  # Enable revalidation using If-Modified-Since and If-None-Match for stale items
+  fastcgi_cache_revalidate on;
+
+  keepalive_requests 0;
 
   # Ignore client abort as it causes issues with the pipeline
   fastcgi_ignore_client_abort on;
@@ -34,6 +41,8 @@ location ~* "^/layer/<%= @layer %>/(\d+)/(\d+)/(\d+)\.(png|jpg|jpeg)$" {
 
   # Add HTTP Cache-Control + Expires Headers
   expires 7d;
+  add_header Cache-Control "stale-while-revalidate=604800, stale-if-error=604800";
+  add_header x-cache-status $upstream_cache_status;
 
   # Allow CORS requests
   add_header 'Access-Control-Allow-Origin' '*';