How to remove .html from the end of URL using .htaccess?

Question

htaccess

How to remove .html from the end of URL using .htaccess?
I prescribed

RewriteEngine on
RewriteBase /
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /([^.]+)\.html\ HTTP
RewriteRule ^([^.]+)\.html$ site.ru/$1 [R=301,L]
RewriteCond %{REQUEST_URI} !(\.[^./]+)$
RewriteCond %{REQUEST_fileNAME} !-d
RewriteCond %{REQUEST_fileNAME} !-f
RewriteRule (.*) /$1.html

<IfModule mod_rewrite.c> 
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /index\.html\ HTTP/ 
RewriteRule ^index\.html$ http://%{HTTP_HOST}/ [R=301,L]
</IfModule>

# php -- BEGIN cPanel-generated handler, do not edit
# Set the “ea-php72” package as the default “PHP” programming language.
<IfModule mime_module>
  AddHandler application/x-httpd-ea-php72 .php .php7 .phtml
</IfModule>
# php -- END cPanel-generated handler, do not edit

html is missing but throws an error

Not Found
The requested URL was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

What is the problem or where did I go wrong?
calibri.ca

Answer 1

RewriteEngine on
RewriteBase /
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /([^.]+)\.html\ HTTP
RewriteRule ^([^.]+)\.html$ site.ru/$1 [R=301,L]
RewriteCond %{REQUEST_URI} !(\.[^./]+)$
RewriteCond %{REQUEST_fileNAME} !-d
RewriteCond %{REQUEST_fileNAME} !-f
RewriteRule (.*) /$1.html

<IfModule mod_rewrite.c> 
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /index\.html\ HTTP/ 
RewriteRule ^index\.html$ http://%{HTTP_HOST}/ [R=301,L]
</IfModule>

Replaced by

RewriteEngine on
RewriteBase /

RewriteCond %{THE_REQUEST} "^GET ([^?]*?)(/index)?\.html"
RewriteRule ^ %1 [R=301,L]

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