how to permit the "?" and "=" in the url ?

[eluser]TheFuzzy0ne[/eluser]
You need to escape the question mark:

Code:

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

Why do you need to use those characters? If you really need to use query strings, you should enable that via your config.php file. I don't believe you need to add those characters, but I'm not sure.

Using an htaccess file can negate the need to use a question mark, and using [url="http://ellislab.com/forums/viewthread/106502/#536309"]my alternate URI syntax library[/url] can negate the need to use "=".