How to use

com.offbytwo.jenkins.client.PreemptiveAuth

constructor

/**
 * Add authentication to supplied builder.
 * @param builder the builder to configure
 * @param uri the server URI
 * @param username the username
 * @param password the password
 * @return the passed in builder
 */
protected static HttpClientBuilder addAuthentication(final HttpClientBuilder builder, 
    final URI uri, final String username,
    String password) {
  if (isNotBlank(username)) {
    CredentialsProvider provider = new BasicCredentialsProvider();
    AuthScope scope = new AuthScope(uri.getHost(), uri.getPort(), "realm");
    UsernamePasswordCredentials credentials = new UsernamePasswordCredentials(username, password);
    provider.setCredentials(scope, credentials);
    builder.setDefaultCredentialsProvider(provider);
    builder.addInterceptorFirst(new PreemptiveAuth());
  }
  return builder;
}

/**
 * Create an authenticated Jenkins HTTP client
 * 
 * @param uri
 *            Location of the jenkins server (ex. http://localhost:8080)
 * @param username
 *            Username to use when connecting
 * @param password
 *            Password or auth token to use when connecting
 */
public JenkinsHttpClient(URI uri, String username, String password) {
  this(uri);
  if (isNotBlank(username)) {
    CredentialsProvider provider = client.getCredentialsProvider();
    AuthScope scope = new AuthScope(uri.getHost(), uri.getPort(), AuthScope.ANY_REALM);
    UsernamePasswordCredentials credentials =
        new UsernamePasswordCredentials(username, password);
    provider.setCredentials(scope, credentials);
    
    localContext = new BasicHttpContext();
    localContext.setAttribute("preemptive-auth", new BasicScheme());
    client.addRequestInterceptor(new PreemptiveAuth(), 0);
  }
}

client.addRequestInterceptor(new PreemptiveAuth(), 0);