Magento + htaccess + mod_rewrite: Forcing trailing slash & Force lower case URL

Question

I am trying to make some changes to my htaccess file for my Magento store to force a trailing slash at the end of all URL's that are not a file AND are not .html (product pages). At the same time, I am trying to force all lower case in URL's as well. Both of these are for SEO reasons, as links to /category, /Category, and /category/ are all viewed as different pages by Google.

Here is the rewrite section of the .htaccess as it stands:

<IfModule mod_rewrite.c>

Options +FollowSymLinks
RewriteEngine on

RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
RewriteCond %{REQUEST_URI} !^/(media|skin|js)/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-l

RewriteRule .* index.php [L]

</IfModule>

I was shown these two snippets, the first for forcing lower case, the second for trailing slash:

RewriteMap  lc int:tolower
RewriteCond %{REQUEST_URI} [A-Z]
RewriteRule (.*) ${lc:$1} [R=301,L]

and...

RewriteCond %{REQUEST_URI} !(.*)/$
RewriteRule ^(.*)$ http://domain.com/$1/ [L,R=301]

However I don't know exactly how or where to insert these into the existing rewrites so everything works as desired.

Answer 1

Put this in your .htaccess:

Options +FollowSymLinks
RewriteEngine on
RewriteBase /

RewriteCond %{REQUEST_URI} [A-Z]
RewriteRule (.*) ${lc:$1} [L,R=301]

RewriteCond %{REQUEST_URI} !(.*)/$
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} !^index.php
RewriteCond %{REQUEST_URI} !\.(html|jpg|png|gif)$
RewriteRule ^(.*)$ $1/ [L,R=301]

RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
RewriteCond %{REQUEST_URI} !^/(media|skin|js)/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-l

RewriteRule .* index.php [L]

</IfModule>

and put this in your vhost config or httpd.conf:

RewriteMap  lc int:tolower