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 "";
fastcgi_keep_conn off;
fastcgi_cache_lock on;
- fastcgi_cache_lock_timeout 30s;
fastcgi_cache_valid 200 21d;
- fastcgi_cache_use_stale error timeout updating http_500 http_503;
+
+ # Serve stale cache on errors or if updating
+ fastcgi_cache_use_stale error timeout updating http_500 http_503 http_504;
+ # 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;
# Ignore client abort as it causes issues with the pipeline
fastcgi_ignore_client_abort on;