How to use com.ning.http.client.spnego

  authorizationHeader = "Negotiate " + SpnegoEngine.INSTANCE.generateToken(host);
} catch (Throwable e) {
  throw new IOException(e);

token = spnegoGenerator.generateSpnegoDERObject(token);

private Realm kerberosProxyChallenge(Channel channel,//
    List<String> proxyAuth,//
    Request request,//
    ProxyServer proxyServer,//
    FluentCaseInsensitiveStringsMap headers,//
    NettyResponseFuture<?> future) throws NTLMEngineException {
  Uri uri = request.getUri();
  try {
    String challengeHeader = SpnegoEngine.INSTANCE.generateToken(proxyServer.getHost());
    headers.remove(HttpHeaders.Names.AUTHORIZATION);
    headers.add(HttpHeaders.Names.AUTHORIZATION, "Negotiate " + challengeHeader);
    return proxyServer.realmBuilder()//
        .setUri(uri)//
        .setMethodName(request.getMethod())//
        .setScheme(Realm.AuthScheme.KERBEROS)//
        .build();
  } catch (Throwable throwable) {
    String ntlmAuthenticate = getNTLM(proxyAuth);
    if (ntlmAuthenticate != null) {
      return ntlmProxyChallenge(ntlmAuthenticate, request, proxyServer, headers, future);
    }
    requestSender.abort(channel, future, throwable);
    return null;
  }
}

token = spnegoGenerator.generateSpnegoDERObject(token);

private Realm kerberosChallenge(Channel channel,//
    List<String> authHeaders,//
    Request request,//
    FluentCaseInsensitiveStringsMap headers,//
    Realm realm,//
    NettyResponseFuture<?> future) throws NTLMEngineException {
  Uri uri = request.getUri();
  String host = request.getVirtualHost() == null ? uri.getHost() : request.getVirtualHost();
  try {
    String challengeHeader = SpnegoEngine.INSTANCE.generateToken(host);
    headers.remove(HttpHeaders.Names.AUTHORIZATION);
    headers.add(HttpHeaders.Names.AUTHORIZATION, "Negotiate " + challengeHeader);
    return new Realm.RealmBuilder().clone(realm)//
        .setUri(uri)//
        .setMethodName(request.getMethod())//
        .setScheme(Realm.AuthScheme.KERBEROS)//
        .build();
  } catch (Throwable throwable) {
    String ntlmAuthenticate = getNTLM(authHeaders);
    if (ntlmAuthenticate != null) {
      return ntlmChallenge(ntlmAuthenticate, request, headers, realm, future);
    }
    requestSender.abort(channel, future, throwable);
    return null;
  }
}

token = spnegoGenerator.generateSpnegoDERObject(token);

  authorizationHeader = "Negotiate " + SpnegoEngine.INSTANCE.generateToken(host);
} catch (Throwable e) {
  throw new IOException(e);

  authorizationHeader = "Negotiate " + SpnegoEngine.INSTANCE.generateToken(host);
} catch (Throwable e) {
  throw new IOException(e);