Why is the robots.txt file accessible via http and https when redirected to https?

Question

htaccess

The site for fsekh files has a redirect from http to https. Everything works correctly, but for some reason robots.txt is available via both protocols, but I need everything to be via https.
.htaccess file:

RewriteEngine On

RewriteCond %{REQUEST_URI} ^/index.html$ [NC]
RewriteRule .+ https://zaoks.ru/ [R=301,L] 

#RewriteCond %{ENV:HTTPS} !on
#RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

DirectorySlash Off
RewriteEngine on
RewriteBase /
RewriteCond %{THE_REQUEST} "^\S+ /([^?.]+)\.html"
RewriteRule ^(?:index|([^.]+))\.html$ https://zaoks.ru/$1 [R=301,L]

RewriteCond %{HTTPS} !on [OR]
RewriteCond %{HTTP_HOST} ^www\. [NC]
RewriteRule ^(.*)$ https://zaoks.ru/$1 [R=301,L]

RewriteCond %{REQUEST_URI} !\?
RewriteCond %{REQUEST_URI} !\&
RewriteCond %{REQUEST_URI} !\=
RewriteCond %{REQUEST_URI} !\.
RewriteCond %{REQUEST_URI} ![^\/]$
RewriteRule ^(.*)\/$ https://zaoks.ru/$1 [R=301,L]

RewriteCond %{DOCUMENT_ROOT}/$1.html -f
RewriteRule ^([^.]+)$ /$1.html [L]

ErrorDocument 404 /404.html
#RewriteRule ^index\.html$ / [NC,R,L]

<Files ~ "\.pdf$">
  Header set X-Robots-Tag "noindex, nofollow"
</Files>

Answer 1

Probably Nginx serves the file on its own and does not proxy such requests to Apache.