How to restrict access to the site by cookie through .htaccess?

Question

htaccess

Current .htaccess

RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.html [L]

How to deny access to the site if the cookie (for example, auth) is not equal to a certain value (for example, ok)

Answer 1

ErrorDocument 403 /403.html

RewriteEngine on

RewriteCond %{ENV:REDIRECT_STATUS} ^$
RewriteCond %{HTTP_COOKIE}  !auth=ok
RewriteRule ^ - [F]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.html [L]