Cookies received during authentication challenge not processed

final TargetAuthenticationStrategy authStrategy = new TargetAuthenticationStrategy() {
    private final ResponseProcessCookies fResponseProcessCookies = new ResponseProcessCookies();
    private final RequestAddCookies fRequestAddCookies = new RequestAddCookies();

    @Override
    public Map<String, Header> getChallenges(HttpHost authhost,
                                             HttpResponse response,
                                             HttpContext context) throws MalformedChallengeException {
        try {
            fResponseProcessCookies.process(response, context);
            final HttpClientContext clientContext = HttpClientContext.adapt(context);
            final HttpRequest request = clientContext.getRequest();
            request.removeHeaders("Cookie");
            fRequestAddCookies.process(request, context);
        } catch (HttpException | IOException e) {
            throw new MalformedChallengeException(e.getMessage(), e);
        }
        return super.getChallenges(authhost, response, context);
    }
};

final CloseableHttpClient authClient = httpClientBuilder
    .setTargetAuthenticationStrategy(authStrategy)
    .build();