htaccess remove html and php duplicated is not working - .htaccess

Question

this snippet works fine for removing php extension
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}\.php -f
RewriteRule ^(.*)$ $1.php
However, if I add html condition, it will not work
RewriteCond %{REQUEST_FILENAME}\.html -f
RewriteRule ^(.*)$ $1.html
Did I do something wrong?

Answer 1

You may try this instead, in one .htaccess file at root directory:
Options +FollowSymlinks -MultiViews
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteCond %{REQUEST_URI} !\.php [NC]
RewriteRule .* %{REQUEST_URI}.php [NC,L]
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME}.html -f
RewriteCond %{REQUEST_URI} !\.html [NC]
RewriteRule .* %{REQUEST_URI}.html [NC,L]
You should be aware the implementation in your code works only when the request doesn't have a trailing slash. I just modified your code to work, but I think it's worth nothing that problem. For example:
For a request like http://example.com/filename/, the file to match with condition RewriteCond %{REQUEST_FILENAME}.php -f is filename/.php. That file can't exist, therefore, the respective rule will be never used.
Option to remove the trailing slash when present:
Add these lines after RewriteEngine On in the previous code:
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} /(.*[^/]+)/$ [NC]
RewriteRule .* /%1 [NC,L]