public SamlServiceProviderBuilder requestIdManager(SamlRequestIdManager requestIdManager) {
        this.requestIdManager = requireNonNull(requestIdManager, "requestIdManager");
        return this;
    }
Sets a {@link SamlRequestIdManager} which creates and validates a SAML request ID.
saml/src/main/java/com/linecorp/armeria/server/saml/SamlServiceProviderBuilder.java