daemon off;
worker_processes 2;
pid logs/nginx.pid;
error_log logs/error.log notice;
events { worker_connections 1024; }
http {
    limit_req_zone $arg_key zone=smooth:1m rate=10r/s;
    limit_req_zone $arg_key zone=immediate:1m rate=10r/s;
    limit_req_zone $arg_key zone=threshold:1m rate=10r/s;
    limit_req_zone $arg_key zone=observe:1m rate=10r/s;
    limit_req_zone $arg_key zone=multi_ip:1m rate=10r/s;
    limit_req_zone $server_name zone=multi_total:1m rate=5r/s;
    log_format measured escape=json
        '{"key":"$arg_key","pid":$pid,"status":$status,'
        '"limit":"$limit_req_status","request_time":$request_time}';
    server {
        listen 127.0.0.1:__FRONTEND_PORT__;
        server_name rate-lab;
        access_log logs/access.jsonl measured;
        limit_req_status 429;
        add_header X-Limit-Status $limit_req_status always;
        add_header X-Worker $pid always;
        location = /health {
            proxy_pass http://127.0.0.1:__BACKEND_PORT__;
        }
        location = /smooth {
            limit_req zone=smooth burst=5;
            proxy_pass http://127.0.0.1:__BACKEND_PORT__;
        }
        location = /immediate {
            limit_req zone=immediate burst=5 nodelay;
            proxy_pass http://127.0.0.1:__BACKEND_PORT__;
        }
        location = /threshold {
            limit_req zone=threshold burst=5 delay=2;
            proxy_pass http://127.0.0.1:__BACKEND_PORT__;
        }
        location = /observe {
            limit_req zone=observe burst=5;
            limit_req_dry_run on;
            proxy_pass http://127.0.0.1:__BACKEND_PORT__;
        }
        location = /multi {
            limit_req zone=multi_ip burst=5 nodelay;
            limit_req zone=multi_total burst=3;
            proxy_pass http://127.0.0.1:__BACKEND_PORT__;
        }
    }
}