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how does nginx work on "Welcome to nginx" page? - 2 years ago

i made web server on vagrant with centos7,nginx, php-fpm. and i did mv /usr/share/nginx/html /usr/share/nginx/html_bk but browser still dispaly "Welcome to nginx on Fedora!" then i added directive on nginx.conf autoindex off; browser keeps dispalyng "Welcome to nginx on Fedora!". i want to understand how nginx display this page. hope someone would reply. thanks