Accept symbols on URL

[eluser]Kevin_3_57[/eluser]
Hi people, I'm having trouble with allowing some symbols on the url in Ci. As i'm using Facebook PHP Api, I get some symbols on the URL due to the crossdomain receiver. Anyway, the only thing I want is to be able to put characters as { } ? : | " , & on the url, so I modified:

Code:

$config['permitted_uri_chars'] = '';

and leave it to blank like the example above and didn't work, I still get the Disallowed Key Characters error.

So, I tried with this:

Code:

$config['permitted_uri_chars'] = 'a-z 0-9~%.,&:?{}|=_\-';

But that didn't work either.

So, CI guru's, any idea?

Thanks in advance!,
Kevin.