nginx.conf

events {
    worker_connections 1024;
    use epoll;
    multi_accept on;
}

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" '
                    'rt=$request_time uct="$upstream_connect_time" '
                    'uht="$upstream_header_time" urt="$upstream_response_time"';

    access_log /var/log/nginx/access.log main;
    error_log /var/log/nginx/error.log warn;

    # Performance optimizations
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    client_max_body_size 10M;

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

    # Rate limiting
    limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;
    limit_req_zone $binary_remote_addr zone=auth:10m rate=5r/s;
    limit_req_status 429;

    # Upstream backend
    upstream app_backend {
        least_conn;
        server web:3000 max_fails=3 fail_timeout=30s;
        keepalive 16;
    }

    # Redirect HTTP to HTTPS (optional)
    server {
        listen 80;
        server_name _;
        
        # Allow health checks
        location /health {
            proxy_pass http://app_backend;
            proxy_set_header Host $host;
            access_log off;
        }

        # Redirect everything else to HTTPS
        # location / {
        #     return 301 https://$server_name$request_uri;
        # }

        # For development, proxy everything
        location / {
            limit_req zone=api burst=20 nodelay;
            
            proxy_pass http://app_backend;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto $scheme;
            
            # Timeouts
            proxy_connect_timeout 60s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;
            
            # Buffer settings
            proxy_buffering on;
            proxy_buffer_size 4k;
            proxy_buffers 8 4k;
        }
    }

    # HTTPS configuration (uncomment for production with SSL)
    # server {
    #     listen 443 ssl http2;
    #     server_name your-domain.com;
    #     
    #     ssl_certificate /etc/nginx/ssl/cert.pem;
    #     ssl_certificate_key /etc/nginx/ssl/key.pem;
    #     
    #     # SSL configuration
    #     ssl_protocols TLSv1.2 TLSv1.3;
    #     ssl_ciphers ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384;
    #     ssl_prefer_server_ciphers off;
    #     ssl_session_cache shared:SSL:10m;
    #     ssl_session_timeout 10m;
    #     
    #     # Security headers
    #     add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    #     add_header X-Frame-Options DENY always;
    #     add_header X-Content-Type-Options nosniff always;
    #     add_header X-XSS-Protection "1; mode=block" always;
    #     
    #     location / {
    #         limit_req zone=api burst=20 nodelay;
    #         
    #         proxy_pass http://app_backend;
    #         proxy_set_header Host $host;
    #         proxy_set_header X-Real-IP $remote_addr;
    #         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    #         proxy_set_header X-Forwarded-Proto $scheme;
    #         
    #         proxy_connect_timeout 60s;
    #         proxy_send_timeout 60s;
    #         proxy_read_timeout 60s;
    #     }
    #     
    #     # Rate limit auth endpoints more strictly
    #     location /auth/ {
    #         limit_req zone=auth burst=10 nodelay;
    #         
    #         proxy_pass http://app_backend;
    #         proxy_set_header Host $host;
    #         proxy_set_header X-Real-IP $remote_addr;
    #         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    #         proxy_set_header X-Forwarded-Proto $scheme;
    #     }
    #     
    #     # Health check without rate limiting
    #     location /health {
    #         proxy_pass http://app_backend;
    #         proxy_set_header Host $host;
    #         access_log off;
    #     }
    #     
    #     # Metrics endpoint (restrict in production)
    #     location /metrics {
    #         # allow 10.0.0.0/8;
    #         # deny all;
    #         proxy_pass http://app_backend:8001;
    #         proxy_set_header Host $host;
    #         access_log off;
    #     }
    # }
}