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

    # gzip
    gzip on;
    gzip_vary on;
    gzip_types text/css application/javascript application/json image/svg+xml text/plain;
    gzip_min_length 512;

    # index.html: never cache (so welcome screen / wiring updates land instantly)
    location = /index.html {
        add_header Cache-Control "no-store, must-revalidate" always;
    }

    # static assets: cache 1h
    location ~* \.(?:css|js|json|svg|png|jpe?g|webp|gif|ico|woff2?)$ {
        add_header Cache-Control "public, max-age=3600" always;
        try_files $uri =404;
    }

    location / {
        try_files $uri $uri/ /index.html;
    }
}