title: SAML Authentication on API Rest, open the authentication page
body: <p>I am really new to SAML, and i had to set up a SAML authentication system.
  We are working on API Platform and Angular 7+.</p>
  
  <p>Everything's working fine, the API authenticate to the SSO with SAML and the client authenticate to the API with JWT.</p>
  
  <p>But the problem is, when a user is not authenticated to the SSO, how to tell to the client "redirect the user or open a popup" to the SSO authentication page.</p>
  
  <p>I searched some answers, but it looks like SAML Authentication is not really famous in Rest API World.</p>
  
  <p>Thanks in advance.</p>