worker_processes auto;

events {
    worker_connections 1024;
}

http {
    map $http_x_map $map_guard {
        default "miss";
        ~^([A-Za-z0-9._~=-]+)$ "mapped";
    }

    server {
        listen 8080;
        server_name _;

        location ~ ^/preview/([A-Za-z0-9._~-]+)$ {
            add_header X-Preview "$1|$map_guard|$1";
            return 200 "$1|$map_guard|$1";
        }

        location = /admin {
            internal;
            return 200 "Need admin token to access";
        }
    }
}