nginx.conf

# Nginx configuration for ECG Classification API

events {
    worker_connections 1024;
}

http {
    upstream ecg_api {
        least_conn;
        server ecg-api:8000;
    }

    # Rate limiting
    limit_req_zone $binary_remote_addr zone=api_limit:10m rate=100r/s;
    limit_req_status 429;

    server {
        listen 80;
        server_name localhost;

        # 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;

        # Logging
        access_log /var/log/nginx/ecg_access.log;
        error_log /var/log/nginx/ecg_error.log;

        # API endpoints
        location / {
            limit_req zone=api_limit burst=20 nodelay;
            
            proxy_pass http://ecg_api;
            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;

            # CORS headers
            add_header Access-Control-Allow-Origin * always;
            add_header Access-Control-Allow-Methods "GET, POST, OPTIONS" always;
            add_header Access-Control-Allow-Headers "DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization" always;

            if ($request_method = 'OPTIONS') {
                add_header Access-Control-Allow-Origin * always;
                add_header Access-Control-Allow-Methods "GET, POST, OPTIONS" always;
                add_header Access-Control-Allow-Headers "DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization" always;
                add_header Access-Control-Max-Age 1728000;
                add_header Content-Type 'text/plain; charset=utf-8';
                add_header Content-Length 0;
                return 204;
            }
        }

        # Health check endpoint (no rate limiting)
        location /health {
            proxy_pass http://ecg_api;
            proxy_set_header Host $host;
            access_log off;
        }

        # Static files (if any)
        location /static {
            alias /usr/share/nginx/html/static;
            expires 30d;
        }
    }

    # HTTPS configuration (uncomment and configure with SSL certificates)
    # 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_protocols TLSv1.2 TLSv1.3;
    #     ssl_ciphers HIGH:!aNULL:!MD5;
    #
    #     location / {
    #         proxy_pass http://ecg_api;
    #         # ... (same proxy settings as above)
    #     }
    # }
}