public static void main(final String[] args) throws Exception {
        try (final CloseableHttpClient httpclient = HttpClients.createDefault()) {

            final HttpHost target = new HttpHost("http", "httpbin.org", 80);

            final HttpClientContext localContext = ContextBuilder.create()
                    .useCredentialsProvider(CredentialsProviderBuilder.create()
                            .add(target, new UsernamePasswordCredentials("user", "passwd".toCharArray()))
                            .build())
                    .build();

            final HttpGet httpget = new HttpGet("http://httpbin.org/digest-auth/auth/user/passwd");

            System.out.println("Executing request " + httpget.getMethod() + " " + httpget.getUri());
            for (int i = 0; i < 3; i++) {
                httpclient.execute(httpget, localContext, response -> {
                    System.out.println("----------------------------------------");
                    System.out.println(httpget + "->" + new StatusLine(response));
                    EntityUtils.consume(response.getEntity());

                    final AuthExchange authExchange = localContext.getAuthExchange(target);
                    if (authExchange != null) {
                        final AuthScheme authScheme = authExchange.getAuthScheme();
                        if (authScheme instanceof DigestScheme) {
                            final DigestScheme digestScheme = (DigestScheme) authScheme;
                            System.out.println("Nonce: " + digestScheme.getNonce() +
                                    "; count: " + digestScheme.getNounceCount());
                        }
                    }
                    return null;
                });
            }
        }
    }
An example of how HttpClient can authenticate multiple requests
using the same Digest scheme. After the initial request / response exchange
all subsequent requests sharing the same execution context can re-use
the last Digest nonce value to authenticate with the server.
httpclient5/src/test/java/org/apache/hc/client5/http/examples/ClientPreemptiveDigestAuthentication.java