# Don't set user - let Docker/container do that
# user nginx;

server {
    listen 3000;
    server_name _;

    root /usr/share/nginx/html;
    index index.html index.htm;

    # Gzip compression
    gzip on;
    gzip_types text/plain text/css text/javascript application/javascript application/json;
    gzip_min_length 1000;

    # Cache control
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # HTML - don't cache
    location ~* \.html$ {
        expires -1;
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }

    # SPA - route all requests to index.html
    location / {
        try_files $uri $uri/ /index.html;
        expires -1;
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }

    # Security headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # Error pages
    error_page 404 /index.html;
    error_page 500 502 503 504 /index.html;
}