How do I redirect an old URL like https://example.com/folder1/abc to a new URL like https://example.com/abc.html permanently in a Cakephp?

Need Help
6

Thanks for the suggestions.
I have modified the .htaccess files inside the webroot. I have changed the .htaccess file present at app/webroot/.htaccess as below -

<IfModule mod_rewrite.c>
	RewriteEngine On
    Redirect 301 /folder1/abc  /abc.html    
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^(.*)$ index.php [QSA,L]
</IfModule>

But still it is not working.