nginx - 如何阻止 Nginx 上的攻击，如下面的代码？

Question

该错误显示在 error.log 中，并且服务器遭受了多个类似这样的请求。

FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: 127.0.0.1, server: "attacker's ip", request: "GET /random characters.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "my server ip"

请寻求帮助。