private void buildResponseOnAuthenticateFailure(RequestContext context, AbstractResponse response) {
        authenticationFailureSend = context.buildResponseSend(response);
    }
Build a {@link Send} response on {@link #authenticate()} failure. The actual response is sent out when
{@link #sendAuthenticationFailureResponse()} is called.
clients/src/main/java/org/apache/kafka/common/security/authenticator/SaslServerAuthenticator.java