In our scenario we have CA Single Sign-On as the SP and a third-party provider as an IDP. We want to be able to specify the display language of the IDP login page in order to bypass the browser language. We have setup a Partnership Federation for this.
The provider can handle the language specified in the querystring like this : https://idp.sampCSP.com/cbs/...?SAMLRequest=<AuthnRequest>&lang=fr
If I add the language in the querystring of the saml2authnrequest (/affwebservices/public/saml2authnrequest?ProviderID=<ProviderID>&lang=fr), the "lang" querystring is lost when redirecting to the URL of the IDP ( /federation/profile/SAML2/Redirect/SSO?SAMLRequest=<AuthnRequest>).
Is it possible to add a querystring to the redirection ? And if do, how do I acheive this ?