server {
    listen 80;
    server_name _;
    root /usr/share/nginx/html;
    index index.html;

    # nginx only sees its own container-internal port (80) and has no idea
    # docker-compose maps that to some other host port — an absolute redirect
    # (e.g. nginx's own trailing-slash directory redirect) would silently
    # drop that external port from the Location header. A relative Location
    # lets the browser resolve it against whatever host:port it's already on.
    absolute_redirect off;

    # The stock /etc/nginx/mime.types (included by the base image's own
    # nginx.conf) already maps .wasm/.woff2/.html correctly. .webmanifest
    # isn't in it, so it's set per-location below rather than via a
    # server-level types{} block, which would replace that whole map instead
    # of extending it. .data has no meaningful type of its own and correctly
    # falls through to the base config's default_type (application/octet-stream).
    location = /manifest.webmanifest {
        default_type application/manifest+json;
        add_header Cache-Control "no-cache";
    }

    location = /sw.js {
        add_header Cache-Control "no-cache";
    }

    # Large, effectively-immutable engine binaries — keep gzip off so nginx
    # can still serve byte-range/If-Range requests (on-the-fly gzip disables
    # range serving), and cache them aggressively.
    location /vendor/vpinball-wasm/ {
        gzip off;
        add_header Cache-Control "public, max-age=31536000, immutable";
    }

    # error_page preserves the 404 status while serving the prerendered
    # not-found page's content — a bare `try_files ... /404.html;` fallback
    # would serve that same content with a 200, since try_files treats an
    # existing fallback file as a normal successful response.
    error_page 404 /404.html;
    location = /404.html {
        internal;
    }

    location / {
        try_files $uri $uri/ $uri.html =404;
    }
}