Escape ? in URL

[eluser]Unknown[/eluser]
Hi everybody,

I got a problem, I'm trying to use phpcas in CodeIgniter and I'm struggling with the way phpcas uses tickets with $_GET variables.

After I connected, CAS server redirects me on my page with the kind of URL :
.../index.php/login/auth?ticket=ST-55743-Tj9b7bRHNzPI9fQRPNXHwkDtDfgyVIucKjD-20

Unfortunately, CodeIgniter returns me an error 404 because of the question mark.

I don't have access to CAS server so I'm compelled to deal with this kind of URL.

I tried to add a slash after "auth" in my url so that "?ticket=ST-..." can be considered as a parameter in my url but the question mark remains a problem.

Does anybody know a way to solve my problem?