nginx.conf

pid         logs/nginx.pid;
error_log   logs/nginx-main_error.log debug;

# Development Mode
master_process      off;
daemon              off;
worker_processes    1;
worker_rlimit_core  500M;
working_directory /tmp;
debug_points abort;

events {
    worker_connections  1024;
    #use                 kqueue; # MacOS
    use                 epoll; # Linux
}

http {
    default_type    application/octet-stream;

    log_format main '["$time_local"] $remote_addr ($status) $body_bytes_sent $request_time $host '
                  '$upstream_cache_status $upstream_response_time '
                  '$http_x_forwarded_for ["$request"] ["$http_user_agent"] ["$http_referer"] ';

    access_log      logs/nginx-http_access.log main;
    error_log       logs/nginx-http_error.log;

    proxy_cache_path /tmp/cache_zone levels=1:2 keys_zone=zone:10m inactive=1m max_size=100m;
    proxy_cache_path /tmp/cache_other_zone levels=1:2 keys_zone=other_zone:1m inactive=10m max_size=10m;

    #selective_cache_purge_redis_unix_socket "/tmp/redis.sock";
    selective_cache_purge_redis_host localhost;
    selective_cache_purge_redis_port 6379;
    selective_cache_purge_redis_database 4;

    server {
        listen          8080;
        server_name     localhost;

        location ~ /purge(.*) {
            selective_cache_purge_query "$1*";
        }

        location / {
            add_header "x-cache-status" $upstream_cache_status;

            proxy_pass http://localhost:8081;

            proxy_cache zone;
            proxy_cache_key "$uri";
            proxy_cache_valid 200 2m;
            proxy_cache_use_stale error timeout invalid_header updating http_500;
        }
    }

    server {
        listen          8090;
        server_name     localhost;

        location ~ /purge/.*\.(.*)$ {
            selective_cache_purge_query "*$1";
        }

        location / {
            add_header "x-cache-status" $upstream_cache_status;

            proxy_pass http://localhost:8081;

            proxy_cache other_zone;
            proxy_cache_key "$uri";
            proxy_cache_valid 200 2m;
        }
    }

    server {
        listen          8081;
        server_name     localhost;

        location / {
            if ($arg_x = 1) {
              return 500 "requested url: $uri\n";
            }
            return 200 "requested url: $uri\n";
        }
    }
}