public SamlServiceProviderBuilder schemeAndPort(ServerPort serverPort) {
        hostConfigBuilder.setSchemeAndPortIfAbsent(requireNonNull(serverPort, "serverPort"));
        return this;
    }
Sets a {@link ServerPort} of this service provider.
saml/src/main/java/com/linecorp/armeria/server/saml/SamlServiceProviderBuilder.java