WebSSO Spring + Angular redirect-uri

There is spring-web (security app).

Here is configuration:

   security:
    oauth2:
      client:
        registration:
          *auth:
            provider: *auth
            client-name: Login with the Identity Server
            client-id: ${app.auth-client.client-id}
            client-secret: ${app.auth-client.client-secret}
            authorization-grant-type: authorization_code
            redirect-uri: ?????
    provider:
      *auth:
        token-uri: ${app.auth-client.server-url}/${app.auth-client.realm}/${app.auth-client.server-url-postfix}/token
        authorization-uri: ${app.auth-client.server-url}/${app.auth-client.realm}/${app.auth-client.server-url-postfix}/auth
        user-info-uri: ${app.auth-client.server-url}/${app.auth-client.realm}/${app.auth-client.server-url-postfix}/userinfo
        jwk-set-uri: ${app.auth-client.server-url}/${app.auth-client.realm}/${app.auth-client.server-url-postfix}/certs

The main quiestion is how to resolve redirect uri for UI? There are 2 applications: back(spring) and front(angular)

It works with redirect-uri: {baseUrl}/login/oauth2/code/{registrationId}

But it works only with REST-API and back-end application.

In fact, I want to open UI page - if user isn't auntificated - redirect to auth-server using back. After login - redirect back (redirect-ui ???) to UI page with credentials.

Classical way. But it doesn't wotk with separate UI. For tests I use keycloak.