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# nginx configuration: secure HTTPS with best practices

server {
    listen 80 default_server;
    server_name example.com www.example.com;
    # Redirect all HTTP to HTTPS
    return 301 https://$host$request_uri;
}

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

ssl_certificate     /etc/letsencrypt/live/example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;

# Modern TLS configuration (Mozilla SSL Config Generator — modern profile)
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;

# Session tickets & OCSP stapling
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:10m;
    ssl_stapling on;
    ssl_stapling_verify on;

# HSTS (preload-eligible)
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload" always;

# CAA DNS record (set in your DNS provider):
    # example.com. CAA 0 issue "letsencrypt.org"
    # example.com. CAA 0 issuewild ";"

location / {
        proxy_pass http://app:8000;
    }
}