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-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

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-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----

修改 nginx.conf 的 server 块

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server {
    listen 80 default_server;
    server_name _;
    allow all;
    deny 162.142.125.0/24; # Censys爬虫的IP段公布在其官网 https://support.censys.io/hc/en-us/articles/360043177092-Opt-Out-of-Scanning
    deny 167.94.138.0/24;
    deny 167.94.145.0/24;
    deny 167.94.146.0/24;
    deny 167.248.133.0/24;
    deny 2602:80d:1000:b0cc:e::/80;
    deny 2620:96:e000:b0cc:e::/80;
    if ($http_user_agent ~* (Censys)) {
        return 404;
    }
    location / {
        return 404;
    }
}

server {
    listen 443 ssl http2;
    server_name _ ;
    ssl_certificate     /path/to/emptyssl/crt;
    ssl_certificate_key /path/to/emptyssl/key;
    return 444;
}