title: Keycloak with vaadin and spring security
body: <p>I want to secure my vaadin application with keycloak and spring security. I try to use the "keycloak-spring-security-adapter". 
  My problem is that I want also unauthenticated users to use my application, but with less functionality - I do this with method security and checking which roles the current user has in the UI.</p>
  
  <p>Can I configure the filter so that it ignores unauthenticated requests, but If the token is present uses it?</p>
  
  <p>Thanks</p>
  
  <p>Daniel</p>