Nginx配置真实IP地址转发的实现示例

# 对于 Ubuntu/Debian 系统
sudo apt update
sudo apt install nginx

# 对于 CentOS/RHEL 系统
sudo yum install epel-release
sudo yum install nginx

sudo nano /etc/nginx/nginx.conf

server {
    listen 80;  # 或者 443，取决于你的需求
    server_name your_domain.com;  # 替换为你的域名或 IP 地址

    location / {
        proxy_pass http://your_backend;  # 替换为你的后端服务地址
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;  # 设置 X-Real-IP
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;  # 设置 X-Forwarded-For
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

sudo nginx -t

sudo systemctl reload nginx

func GetIP(r *http.Request) (string, error) {
    ip := r.Header.Get("X-Real-IP")
    if net.ParseIP(ip) != nil {
        return ip, nil
    }

    ip = r.Header.Get("X-Forwarded-For")
    for _, i := range strings.Split(ip, ",") {
        if net.ParseIP(i) != nil {
            return i, nil
        }
    }

    ip, _, err := net.SplitHostPort(r.RemoteAddr)
    if err != nil {
        return "", err
    }

    if net.ParseIP(ip) != nil {
        return ip, nil
    }

    return "", errors.New("no valid ip found")
}

sudo tail -f /var/log/nginx/error.log