# Example reverse proxy boundary for the API service.
# Terminate TLS at the proxy/WAF, keep the API bound to 127.0.0.1 or a private network,
# and only expose /metrics to internal monitoring networks.

server {
    listen 443 ssl http2;
    server_name api.example.com;

    ssl_certificate /etc/nginx/tls/fullchain.pem;
    ssl_certificate_key /etc/nginx/tls/privkey.pem;

    client_max_body_size 1m;

    location /metrics {
        allow 10.0.0.0/8;
        allow 172.16.0.0/12;
        allow 192.168.0.0/16;
        allow 100.64.0.0/10;
        deny all;

        proxy_set_header Host $host;
        proxy_set_header X-Request-ID $request_id;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto https;
        proxy_pass http://127.0.0.1:8080;
    }

    location / {
        proxy_set_header Host $host;
        proxy_set_header X-Request-ID $request_id;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto https;
        proxy_read_timeout 30s;
        proxy_send_timeout 30s;
        proxy_pass http://127.0.0.1:8080;
    }
}