How should data be encoded in the URL

Hi,

I need to put JSON data in my URLs, but when I encode it with urlencode() or rawurlencode() CI complains that "The URI you submitted has disallowed characters."

My current workaround is to first encode using rawurlencode() and then encode the result with base_64encode()... is there a better way to do this?

Code:

base64_encode(rawurlencode($json_data));