anchor.diff:        return 404;
       }
   
  -<% for i in 0..15 do %>
  +<% for i in 0..16 do %>
   <% if i == 0 -%>
       # Default Fallback Location Handler (lowest)
       location / {
  
positive.code:       # Caching
        proxy_cache "proxy_cache_zone";
        proxy_cache_lock on;
        proxy_cache_valid 200 1d;
        proxy_cache_valid 404 15m;
        # Serve stale cache on errors or if updating
        proxy_cache_use_stale error timeout updating http_404 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-cache-status $upstream_cache_status;
  <% end -%>
  
negative.code:       proxy_http_version 1.1;
        proxy_set_header Connection '';
  
        proxy_connect_timeout 20s;
  
        # Replace host header.
        proxy_set_header Host 'tile.openstreetmap.org';
  