GET parameter in homepage when URL rewrite is enabled

[eluser]Unknown[/eluser]
I have this CodeIgniter website, where htaccess redirect is enabled, so pages look like

Code:

website.com/contact

or

Code:

website.com/article/14

or whatever

I can pass a GET parameter for any page, like

Code:

website.com/contact?parameter=32

or

Code:

website.com/article/14?parameter=32

or whatever
but for homepage:

Code:

website.com/?parameter=32

redirects me to 404


I've tried serveral ways to make it accept GET parameters on homepage, but as far as I think, it tries to access a page named "parameter" and redirects me to 404 because of not finding it.

I've tried to add a condition in htaccess something like "redirect only if there is not the parameter 'parameter' set":

Code:

RewriteCond %{QUERY_STRING} !^/index.php?parameter=(.*) [NC]
RewriteRule ^(.*)$ /index.php?/$1 [L]

But no chance.


How can I achive this?

Thank you in advance!

[eluser]Aken[/eluser]
Works fine out of the box for me with 2.1.3. Post your whole .htaccess or something, and specify if CI or your server is generating the 404.