title: Use IdentityServer 4 and WS-Federation
body: <p>I realise that .Net Core doesn't support WS-Federation. However I would really like to use IdentityServer 4, which I realise also doesn't support WS-Federation. </p>
  
  <p>However if I have an ASP.Net Core website and I target the full .Net framework, would it then be possible to use WS-Federation with IdentityServer 4? Is there some sort of interface that can be used?</p>
  
  <p>Like if I used the code from <code>IdentityServer3.WsFederation</code> how hard would it be to port it to use IdentityServer4?</p>