nginx.conf

events {
    worker_connections 1024;
}

http {
    # Upstream configuration for API servers
    upstream api_backend {
        # Use IP hash for sticky sessions (WebSocket compatibility)
        ip_hash;
        
        server api-server-1:5000 max_fails=3 fail_timeout=30s;
        server api-server-2:5000 max_fails=3 fail_timeout=30s;
    }

    # Map for WebSocket upgrade
    map $http_upgrade $connection_upgrade {
        default upgrade;
        '' close;
    }

    server {
        listen 80;
        server_name localhost;

        # Increase timeouts for WebSocket connections
        proxy_connect_timeout 7d;
        proxy_send_timeout 7d;
        proxy_read_timeout 7d;

        # Proxy headers
        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;

        # WebSocket support
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;

        # Disable buffering for WebSocket
        proxy_buffering off;

        # Health check endpoint
        location /health {
            proxy_pass http://api_backend/health;
        }

        # API endpoints
        location /api/ {
            proxy_pass http://api_backend;
        }

        # Socket.io endpoint
        location /socket.io/ {
            proxy_pass http://api_backend;
            proxy_http_version 1.1;
        }

        # Catch-all for other requests
        location / {
            proxy_pass http://api_backend;
        }
    }
}