How to hide "redirect_url" at loginProviders in CAS login page when used delegated authentication?

[zl anson]

Hi all,

    I used CAS to do delegate authenticate to another idp  used saml protocal, and this works fine. A thirdparty button will appears in login corner and when user clicks, it will generate saml url and redirect to idp's login page.

    But question is ,when our website are doing audit, the login page's source will show the

"redirect_url  ", it include the third party's info, we need hide this and do it at backend, how to do this, any help thanks.