nginx-site.default

server_tokens off;

proxy_cache_path  /var/www/cache levels=1:2 keys_zone=osm-backend-cache:8m max_size=5g inactive=7d;

upstream osm_backend {
  server  a.tile.openstreetmap.org;
  server  b.tile.openstreetmap.org;
  server  c.tile.openstreetmap.org;
}

server {
  listen 80 default_server;
  listen [::]:80 default_server;
  root /var/www/html;
  index index.html;
  server_name _;

  location / {
    # First attempt to serve request as file, then
    # as directory, then fall back to displaying a 404.
    try_files $uri $uri/ =404;
  }

  location ~ ^/tiles-cache/(.*)$ {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X_FORWARDED_PROTO http;
    proxy_set_header Host $http_host;

    proxy_cache osm-backend-cache;
    proxy_hide_header Set-Cookie;
    proxy_ignore_headers Set-Cookie;
    proxy_cache_valid  200 302  7d;
    proxy_cache_valid  404      1m;
    proxy_redirect off;
    if (!-f $request_filename) {
      proxy_pass http://osm_backend/$1;
      break;
    }
  }
}