nginx.conf

server {
    listen       80;
    server_name  localhost;
    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
        try_files $uri /index.html;
        # replace WWW-Authenticate header in response if authorization failed
        more_set_headers -s 401 'WWW-Authenticate: Other realm="App"';
    }

    error_page   500 502 503 504  /50x.html;

    location = /50x.html {
        root   /usr/share/nginx/html;
    }
}