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We can check the NGINX configuration files after changes are made to ensure the syntax is correct. To do this, we run the following:

/usr/sbin/nginx -t

You should see the following if everything is correct:

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

If you have any errors, double check your configuration for syntax errors on the lines indicated.