title: SP Initiated SSO using SAML and Spring Security
body: <p>Currently I am working with SP initiated SSO using spring security and SAML. Now,during sign in SP forward authn request to IDP and redirect to IDP's login page for authentication. I have used following URL code sample: 
  <a href="https://github.com/wiwengweng/wiwengweng/tree/master/saml2.demo/src/main/java/org/wso2/identity/saml2/demo" rel="nofollow noreferrer">https://github.com/wiwengweng/wiwengweng/tree/master/saml2.demo/src/main/java/org/wso2/identity/saml2/demo</a> for SSO. </p>
  
  <p>Now, I want to use local page for  user's credential rather than IDP's login page.SO can I post credential during SP--->IDP request in assertion which can validate at IDP and redirect to my home page with SSO ? It is feasible ?</p>