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

        location / {
            proxy_pass http://localhost:8000;
        }
    }
}

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http {
    server {
        listen 80;

        if ($http_host ~* "^(www.)?example.com$") {
            location / {
                proxy_pass http://localhost:8000;
            }
        }

        if ($http_host ~* "^(www.)?example2.com$") {
            return 403;
        }
    }
}

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