nginx.conf

events {
    worker_connections 1024;
}

http {
    # This zone tracks every IP address individually.
    # 10MB can hold 160,000 unique IPs—plenty for your needs.
    limit_req_zone $binary_remote_addr zone=per_ip_limit:20m rate=10r/s;

    server {
        listen 80;

        location / {
            # APPLY THE LIMIT PER IP
            # burst=15: High enough for a mobile app to fetch
            # its initial data on startup without being blocked.
            limit_req zone=per_ip_limit burst=15 nodelay;

            proxy_pass http://api:3000;

            # Critical: Pass the IP so Rust logs are accurate
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $host;
        }
    }
}