https://wayf.aai.dfn.de/DFN-AAI-Basic/wayf?entityID=https%3A%2F%2Fmyvhost.mydomain.de%2Fshibboleth&return=https%3A%2F%2Fmyvhost.mydpmain.de%2FShibboleth.sso%2FLogin%3FSAMLDS%3D1