title: Spring saml - how remember request parameter when initiate login on SP, and procesing them after IdP response
body: <p>I want remember url request parameter from first request of my site (SP) and use them after response from IdP. </p>
  
  <p>I'm using spring-saml extension and think about relayState attribute but can't find example how build it with parameters from request.</p>
  
  <p>I need that for redirect user after sso authentication process to target page (module of application) depends on what was in first request.</p>