.htaccess - Using Apache htaccess file to change URL to lowercase

Question

How can I modify my .htaccess file on Apache to do the following:

"If the URL ends in .aspx, rewrite the entire URL to lowercase."

Backstory: I recently migrated a website from ASPX hosting to Linux/Apache hosting. There are some old URLs in the wild (marketing materials), and I need to make sure that those URLs still work; Windows web servers are not case-sensitive but Linux web servers are.

Thanks in advance.

Answer 1

You need to define a rewrite map which can only be done in server/vhost config files, not in htaccess files. You'll need to add something like:

RewriteMap lc int:tolower

Then in your htaccess file, you can create a rule like:

RewriteCond %{REQUEST_URI} [A-Z]
RewriteRule ^(.*.aspx)$ ${lc:$1} [L,NC]

This will check that there are capital letters in the URI, then apply the map which turns everything into lowercase letters.