nginx.conf

server {
    listen 80;
    server_name _;

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

    # Health check endpoint for k8s probes
    location = /health {
        add_header Content-Type text/plain;
        return 200 'ok';
    }

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css text/xml text/javascript application/javascript application/xml+rss application/json;

    # 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 "no-referrer-when-downgrade" always;

    # API routing is handled by the Envoy Gateway edge.
    # This container only serves static files and the SPA fallback.

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

    # SPA routing - fallback to index.html for all routes
    location / {
        try_files $uri $uri/ /index.html;
        add_header Cache-Control "no-cache";
    }
}