The path of the request is lost when using the url parameter of a Choice module
When using an url in a Choice module (for example with SSL or Keberos, to redirect on another vhost portal to use an Apache authentication module), the path of the initial request is lost, so it breaks IssuerDB flow (CAS, SAML or OpenID Connect)
This issue may solve #1005, but it's not sure as I do not provide the same patch.