Apache mod_rewrite recipes
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Recipes
Redirect to file with different extension
Assuming some file have changed from <basename>.html to <basename>.php. The server should only redirect if the <basename>.html file does not exist.
<IfModule mod_rewrite.c>
RewriteEngine On
## RewriteLog /var/tmp/rewrite_log
## RewriteLogLevel 9
RewriteCond %{DOCUMENT_ROOT}$1 !-f
RewriteCond $3 ^.html?$
RewriteRule ((.*)(\.html?)) $2.php [L]
</IfModule>
The first RewriteCond is to check if the file exists or not the second one determines if the extension is either .htm or .html. Finally the RewriteRule swaps out the file extension and hands it back [L].
Joomla rewrite rule
Ensure in 2.5.x the Global Configuration -> SEO -> Use URL rewriting value is set to Yes.
<IfModule mod_rewrite.c>
RewriteEngine On
## Use when SEO - Adds suffix to URL = YES
## RewriteCond %{REQUEST_URI} (/[^.]*|\.(html?|php))$ [NC]
## Use when SEO - Adds suffix to URL = NO
RewriteCond %{REQUEST_URI} (/[^.]?.+)$ [NC]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* /index.php
</IfModule>