server {
    server_name subdomain.domain.com;

    listen 80;
    listen 443 ssl reuseport;
    http2 on;

    # HTTP to HTTPS
    if ($scheme != "https") {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    location / {
        proxy_http_version 1.1;
        proxy_pass  http://127.0.0.1:3000;
        proxy_set_header Host $host;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Host $host;
        proxy_set_header X-Forwarded-Port $server_port;

        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
    }

    # SSL Configuration (Mozilla Intermediate Guidelines)
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ecdh_curve X25519:prime256v1:secp384r1;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305;
    ssl_prefer_server_ciphers off;

    ssl_session_timeout 1d;
    ssl_session_cache shared:MozSSL:10m; # ~40,000 sessions

    acme letsencrypt;
    ssl_dhparam "/etc/angie/ssl/dhparam.pem"; # curl https://ssl-config.mozilla.org/ffdhe2048.txt > /opt/angie/angie/ssl/dhparam.pem
    ssl_certificate $cert_letsencrypt;
    ssl_certificate_key $cert_key_letsencrypt;

    # OCSP Stapling
    ssl_stapling on;
    ssl_stapling_verify on;
    resolver 1.1.1.1 1.0.0.1 8.8.8.8 8.8.4.4 208.67.222.222 208.67.220.220;

    # HTTP Strict Transport Security (HSTS)
    proxy_hide_header Strict-Transport-Security;
    add_header Strict-Transport-Security "max-age=15552000" always;

    # Gzip Compression
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_buffers 16 8k;
    gzip_http_version 1.1;
    gzip_min_length 256;
    gzip_types
    application/atom+xml
    application/geo+json
    application/javascript
    application/x-javascript
    application/json
    application/ld+json
    application/manifest+json
    application/rdf+xml
    application/rss+xml
    application/xhtml+xml
    application/xml
    font/eot
    font/otf
    font/ttf
    image/svg+xml
    text/css
    text/javascript
    text/plain
    text/xml;
}

server {
    listen 443 ssl default_server;
    listen [::]:443 ssl default_server;
    server_name _;

    ssl_reject_handshake on;
}