server.conf

proxy_cache_path /var/cache/wpcache levels=2:2 keys_zone=wpcache:120m inactive=14d max_size=5120m;
proxy_temp_path /var/cache/wpcache/tmp;

resolver 8.8.8.8 4.2.2.2;

log_format wpcache '$remote_addr - $remote_user [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent" "$upstream_cache_status" "$host" "$http_range"';

server {
  listen 10.0.0.1 default;
  server_name wpcache.host;

  access_log /var/log/nginx/wpcache-access.log wpcache;
  error_log /var/log/nginx/wpcache-error.log;

  proxy_cache wpcache;
  proxy_cache_key "$server_name$request_uri";
  proxy_cache_bypass $arg_nocache;

  proxy_cache_lock on;
  proxy_cache_lock_timeout 1h;
  proxy_cache_use_stale error timeout invalid_header updating http_500 http_502 http_503 http_504;
  proxy_cache_revalidate on;

  proxy_cache_valid 200 30d;
  proxy_cache_valid 301 302 0;

  proxy_max_temp_file_size 1024m;
  proxy_next_upstream error timeout http_404;
  proxy_redirect off;

  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

  proxy_ignore_client_abort on;
  proxy_ignore_headers "Expires" "Cache-Control";

  add_header X-Upstream-Status $upstream_status;
  add_header X-Upstream-Response-Time $upstream_response_time;
  add_header X-Upstream-Cache-Status $upstream_cache_status;

  location /themes/download/ {
    proxy_pass "https://wordpress.org$request_uri";
    proxy_set_header Host wordpress.org;
  }

  location / {
    proxy_pass "https://downloads.wordpress.org$request_uri";
    proxy_set_header Host downloads.wordpress.org;
  }
}