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$ sudo apt-get update
$ sudo apt-get install nginx

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http {
    server {
        listen 80;
        server_name example.com;

        location /api {
            if ($request_body ~* "blacklist") {
                return 403;
            }

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        }
    }
}

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$ sudo systemctl restart nginx

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$ curl -X POST -d "this is blacklist data" http://example.com/api

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$ curl -X POST -d "this is normal data" http://example.com/api

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