Apa itu Reverse Proxy?

Reverse proxy adalah server yang menerima request dari client dan meneruskannya ke backend server. Client tidak tahu server mana yang sebenarnya melayani request.

Manfaat Reverse Proxy

• SSL termination — Handle HTTPS di proxy, HTTP ke backend
• Load balancing — Distribusi traffic ke beberapa server
• Caching — Cache response untuk mengurangi beban backend
• Security — Sembunyikan backend dari internet langsung

Nginx sebagai Reverse Proxy

server {
    listen 80;
    server_name myapp.com;

    location / {
        proxy_pass http://localhost:3000;
        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
    location /ws {
        proxy_pass http://localhost:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }
}

Load Balancing

# Definisi upstream (grup server)
upstream backend {
    # Round-robin (default)
    server 10.0.0.1:3000;
    server 10.0.0.2:3000;
    server 10.0.0.3:3000;
}

# Algoritma lain:
upstream backend_weighted {
    server 10.0.0.1:3000 weight=3;    # 3x lebih banyak traffic
    server 10.0.0.2:3000 weight=1;
}

upstream backend_iphash {
    ip_hash;    # Client selalu ke server yang sama
    server 10.0.0.1:3000;
    server 10.0.0.2:3000;
}

server {
    listen 80;
    location / {
        proxy_pass http://backend;
    }
}