reverse-proxy-frontend/nginx.conf

events {
    worker_connections 1024;
}

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;
    
    # Logging
    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';
    
    access_log /var/log/nginx/access.log main;
    error_log /var/log/nginx/error.log warn;
    
    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/json
        application/javascript
        application/xml+rss
        application/atom+xml
        image/svg+xml;

    server {
        listen 80;
        server_name localhost;
        
        root /usr/share/nginx/html;
        index index.html;
        
        # Security headers
        add_header X-Frame-Options "SAMEORIGIN" always;
        add_header X-XSS-Protection "1; mode=block" always;
        add_header X-Content-Type-Options "nosniff" always;
        add_header Referrer-Policy "no-referrer-when-downgrade" always;
        add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; img-src 'self' data: blob: https://cdn.jsdelivr.net; font-src 'self' https://fonts.gstatic.com; connect-src 'self' http: https:;" always;
        
        # Static assets caching - works for any subfolder or root
        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|json)$ {
            expires 1y;
            add_header Cache-Control "public, immutable";
            try_files $uri =404;
        }
        
        # Dynamic subfolder configuration (generated at build time)
        # SUBFOLDER_PLACEHOLDER
        
        # SPA fallback for root level routes
        location / {
            try_files $uri $uri/ /index.html;
        }
        
        # Health check endpoint
        location /health {
            access_log off;
            return 200 "healthy\n";
            add_header Content-Type text/plain;
        }
    }
}