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server {
    server_name www.demo.com;
    listen 80;

    location / {
        # 配置默认ip
        set $default_ip 127.0.0.1;

        # 配置默认port
        set $default_port 8080;

        # 如果url中包含ip=x
        if ($request_uri ~* ip=(.+?)(&|$)) {
            set $default_ip $1;
        }

        # 如果url中包含port=1
        if ($request_uri ~* port=(\d+?)(&|$)) {
            set $default_port $1;
        }

        # 配置代理参数
        proxy_set_header Connection "";
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_set_header X-NginX-Proxy true;

        # 代理
        proxy_pass http://$default_ip:$default_port;
    }
}