How to secure an angular application with REST backend using SAML

Securing applications
1

Hi,

I am trying to secure an Angular application with a REST backend using SAML.
I have configured the applications and after I successfully authenticate the user on the client application the Angular application is rendered but the calls to the REST fail and return the redirect HTML page. How can I pass the authenticated user credentials to the REST application?

In the environment I have the Angular client deployed as a war file testapp.war in wildfly along with a REST back end deployed as another war file testapp-rest.war.
I have configured clients in keycloak, one for the REST war and one for the Angular war.

In the wildfly I have added the configuration in the standalone.xml:

   <subsystem xmlns="urn:jboss:domain:keycloak-saml:1.3">
        <secure-deployment name="testapp.war">
            <SP entityID="testapp"
                sslPolicy="NONE"
                logoutPage="SPECIFY YOUR LOGOUT PAGE!">
                <IDP entityID="idp">
                    <SingleSignOnService signRequest="false"
                                         validateResponseSignature="false"
                                         validateAssertionSignature="false"
                                         requestBinding="POST"
                                         bindingUrl="http://localhost:8280/auth/realms/myRealm/protocol/saml"/>
                    <SingleLogoutService signRequest="false"
                                         signResponse="false"
                                         validateRequestSignature="false"
                                         validateResponseSignature="false"
                                         requestBinding="POST"
                                         responseBinding="POST"
                                         postBindingUrl="http://localhost:8280/auth/realms/myRealm/protocol/saml"
                                         redirectBindingUrl="http://localhost:8280/auth/realms/myRealm/protocol/saml"/>
                </IDP>
            </SP>
        </secure-deployment>
        <secure-deployment name="testapp-rest.war">
            <SP entityID="testapprest"
                sslPolicy="NONE"
                logoutPage="SPECIFY YOUR LOGOUT PAGE!">
                <IDP entityID="idp">
                    <SingleSignOnService signRequest="false"
                                         validateResponseSignature="false"
                                         validateAssertionSignature="false"
                                         requestBinding="POST"
                                         bindingUrl="http://localhost:8280/auth/realms/myRealm/protocol/saml"/>
                    <SingleLogoutService signRequest="false"
                                         signResponse="false"
                                         validateRequestSignature="false"
                                         validateResponseSignature="false"
                                         requestBinding="POST"
                                         responseBinding="POST"
                                         postBindingUrl="http://localhost:8280/auth/realms/myRealm/protocol/saml"
                                         redirectBindingUrl="http://localhost:8280/auth/realms/myRealm/protocol/saml"/>
                </IDP>
            </SP>
        </secure-deployment>
    </subsystem>

Do I need to add code to the client? Is there any sample that you can point me to?
Thanks,
Ion