+ # 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;
+
+ fastcgi_catch_stderr "Image handling error";
+
+ fastcgi_next_upstream error timeout invalid_header http_500 http_503;
+ fastcgi_next_upstream_tries 8;
+
+ # Do not GZIP tiles