RewriteEngine On

<IfModule mod_headers.c>
    Header set Access-Control-Allow-Origin "*"
</IfModule>

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} (.+)/$
RewriteRule ^ %1 [R=301,L]

RewriteCond %{REQUEST_FILENAME} !-d 
RewriteCond %{REQUEST_FILENAME}\.php -f 
RewriteRule ^(.*)$ $1.php

RewriteRule ^([0-9a-zA-Z-_-]+)/?$ category.php?cat_url=$1&%{QUERY_STRING}

RewriteRule ^(.*)/([0-9a-zA-Z-_-]+)/?$ category.php?cat_url=$1&cat_child_url=$2&%{QUERY_STRING}