RewriteEngine On
RewriteBase /

# Remove trailing slash from HTML files
RewriteRule ^(.*\.html)/+$ /$1 [R=301,L]

# Remove .php extension
RewriteCond %{THE_REQUEST} ^[A-Z]{3,}\s([^.]+)\.php [NC]
RewriteRule ^ %1/ [R=301,L]

# Add trailing slash if not a file or directory
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*[^/])$ /$1/ [L,R=301]

# Internally rewrite to .php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^(.*?)/?$ $1.php [L]

# Handle index
RewriteRule ^index/$ / [R=301,L]

<FilesMatch "\.aspx$">
    ForceType text/html
</FilesMatch>

# php -- BEGIN cPanel-generated handler, do not edit
# Set the “ea-php81” package as the default “PHP” programming language.
<IfModule mime_module>
  AddHandler application/x-httpd-ea-php81 .php .php8 .phtml
</IfModule>
# php -- END cPanel-generated handler, do not edit