一下是反向代理规则：

location ~* \.(gif|jpg|jpeg|png|bmp|js|css)$ {
    valid_referers abc.com abc2.com;#多域名中间用空格分隔
    if ($invalid_referer) {
        return 403;
    }

    proxy_pass https://你要反代的域名;
    proxy_ssl_server_name on;
    proxy_set_header Host 你要反代的域名;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}