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?

I am using Cakephp 2.10. How do I redirect my old URL like https://example.com/folder1/abc to a new URL like https://example.com/pqr.html permanently? I have to do this for more than 200 URLs.

Redirects are generally best done in .htaccess; it eliminates the need to load and run PHP, so the server load is much lighter.

Thanks for Replying. I know that but I am pretty new to CakePHP and I can see that there are lots of .htaccess files. If I go inside the app folder, I see that there are .htaccess files present inside multiple folders so i am not sure if i have to change inside all the .htaccess files?

I have added like this in all the .htaccess files but it is not working-

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

Your RewriteRule ^ index.php [L] says to redirect everything to index.php, and stop processing rules, so your Redirect is never reached. Put it before the first RewriteCond.

You need this only in the .htaccess in your webroot.

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.

Actually, the below code is working -

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

Thanks!