DirectorySlash Off
RewriteEngine On

RewriteCond %{REQUEST_URI} !^/$
RewriteCond %{REQUEST_URI} .+/$
RewriteRule ^(.+?)/$ /$1 [R=301,L]

RewriteCond %{REQUEST_FILENAME} -d

RewriteCond %{REQUEST_FILENAME}/index.php -f
RewriteRule ^(.+)$ $1/index.php [L]

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