upstream tile_cache_backend {
server 127.0.0.1;
+ server 127.0.0.2;
+ server 127.0.0.3;
# Add the other caches to relieve pressure if local squid failing
# Balancer: round-robin
<% end -%>
<% end -%>
- keepalive 1024;
+ keepalive 512;
keepalive_requests 1024;
}
'http://osm.org' 1; # Faked
}
+map $http_referer $osm_referer {
+ default 0; # False
+ '~^https:\/\/www\.openstreetmap\.org\/' 'osm'; # True
+}
+
# Limit Cache-Control header to only approved User-Agents
map $http_user_agent $limit_http_cache_control {
default ''; # Unset Header
return 404;
}
+<% for i in 0..14 do %>
+<% if i == 0 -%>
+ # Default Fallback Location Handler (lowest)
location / {
+<% elsif -%>
+ # Dedicated zoom handler for caching
+ location /<%= i %>/ {
+<% end %>
proxy_pass http://tile_cache_backend;
proxy_set_header X-Forwarded-For $remote_addr;
proxy_http_version 1.1;
proxy_set_header Connection '';
- proxy_connect_timeout 5s;
+ proxy_connect_timeout 10s;
- # Preserve host header.
- proxy_set_header Host $host;
+ # Replace host header.
+ proxy_set_header Host 'tile.openstreetmap.org';
# Do not pass cookies to backends.
proxy_set_header Cookie '';
# Do not pass Accept-Encoding to backends.
proxy_set_header Accept-Encoding '';
+ # Do not pass Accept to backends.
+ proxy_set_header Accept '';
+ # Do not pass Accept-Language to backends as unused.
+ proxy_set_header Accept-Language '';
+ proxy_set_header Accept-Charset '';
+ # Do not send origin, we allow all.
+ proxy_set_header origin '';
+ # Do not pass invalid headers to backend.
+ proxy_set_header X-Forwarded-Host '';
+ proxy_set_header X-Host '';
+ proxy_set_header Authorization '';
+ proxy_set_header Proxy-Authorization '';
+
+ # Drop partial requests
+ proxy_set_header range '';
# Do not allow setting cookies from backends due to caching.
proxy_ignore_headers Set-Cookie;
proxy_hide_header Set-Cookie;
+<% if i != 0 -%>
+ # 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_500 http_503 http_504;
+ # If in cache as stale, serve stale and update in background
+ proxy_cache_background_update on;
+ proxy_cache_min_uses 8;
+
+ add_header X-Nginx-Cache-Status $upstream_cache_status;
+<% end -%>
+
# Set a QoS cookie if none presented (uses nginx Map)
add_header Set-Cookie $cookie_qos_token_set;
<% if node[:ssl][:strict_transport_security] -%>
return 418;
}
+ # Only allow cache purges if from OpenStreetMap referer
+ if ($osm_referer) {
+ # Allow cache purging headers only from select User-Agents (uses nginx Map)
+ proxy_set_header Cache-Control $limit_http_cache_control;
+ proxy_set_header Pragma $limit_http_pragma;
+ }
+ # nginx has no if else logic
+ if ($osm_referer != 'osm') {
+ proxy_set_header Cache-Control '';
+ proxy_set_header Pragma '';
+ }
+
# Strip any ?query parameters from urls
set $args '';
-
- # Allow cache purging headers only from select User-Agents (uses nginx Map)
- proxy_set_header Cache-Control $limit_http_cache_control;
- proxy_set_header Pragma $limit_http_pragma;
}
+<% end %>
}