Nginx & Caddy Reverse Proxy Generator

# ==============================================================================
# Nginx Hardened Reverse Proxy Configuration
# Generated via BestUtilities.org Nginx Reverse Proxy Wizard
# Domain: api.example.com -> Upstream: http://127.0.0.1:3000
# ==============================================================================

# 1. Global Rate Limiting Zone (Drop into http {} block or above server {})
limit_req_zone $binary_remote_addr zone=api_limit:10m rate=20r/s;

upstream backend_nodes {
    server 127.0.0.1:3000;
    keepalive 32;
}

# HTTP to HTTPS Redirect
server {
    listen 80;
    listen [::]:80;
    server_name api.example.com;
    return 301 https://$host$request_uri;
}

# HTTPS Primary Virtual Host
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name api.example.com;

    # SSL TLS Certificates (Certbot Let's Encrypt)
    ssl_certificate /etc/letsencrypt/live/api.example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/api.example.com/privkey.pem;
    ssl_session_timeout 1d;
    ssl_session_cache shared:SSL:10m;
    ssl_session_tickets off;

    # Modern TLS Protocols & Ciphers
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;

    # Security Headers
    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # Client Request Limits
    client_max_body_size 50M;

    location / {
        limit_req zone=api_limit burst=10 nodelay;
        proxy_pass http://backend_nodes;
        proxy_http_version 1.1;

        # Standard Proxy Forwarding 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 Connection Upgrades
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_read_timeout 86400s;
        proxy_send_timeout 86400s;
    }
}