nginx.conf

worker_rlimit_nofile 500000;

events {
    worker_connections 20000;
    multi_accept on;
    use epoll;
}

http {
    access_log off;
    sendfile   on;
    tcp_nopush on;
    tcp_nodelay on;

    types_hash_max_size 2048;
    server_tokens off;

    upstream api {
        server rinha-api-1:8080;
        server rinha-api-2:8080;
        keepalive 64;
    }

    server {
        listen 9999 reuseport;

        location / {
            proxy_pass http://api;
        }

        client_body_timeout 10s;
        client_max_body_size 20m;
        keepalive_timeout 60s;
        keepalive_requests 1000;
        send_timeout 30s;
        proxy_buffer_size 128k;
        proxy_buffers 4 256k;
        proxy_busy_buffers_size 256k;
        proxy_temp_file_write_size 256k;
    }
}