# Acquiring a Token using Advanced REST client
**URL:** https://discuss.elastic.co/t/acquiring-a-token-using-advanced-rest-client/163939
**Category:** Elasticsearch
**Created:** [January 11, 2019, 5:06pm UTC](https://discuss.elastic.co/t/acquiring-a-token-using-advanced-rest-client/163939 "2019-01-11T17:06:19Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@mc1392](https://discuss.elastic.co/u/mc1392)
#### Post date: [January 11, 2019, 5:06pm UTC](https://discuss.elastic.co/t/acquiring-a-token-using-advanced-rest-client/163939/1 "2019-01-11T17:06:19Z")
When using Advanced REST client to acquire a token, should I set authentication to basic, just to obtain the token, then my next request should be OAUTH2?
or do I start with OAUTH2 with the GRANT TYPE set to "password" or "client credentials"?
I am a bit confused.
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### Author:  [@baz](https://discuss.elastic.co/u/baz)
#### Post date: [January 18, 2019, 3:18pm UTC](https://discuss.elastic.co/t/acquiring-a-token-using-advanced-rest-client/163939/2 "2019-01-18T15:18:13Z")
under the hood the `RestClient` just uses the [apache HttpAsyncClient](https://github.com/apache/httpasyncclient/blob/4.1.x/httpasyncclient/src/main/java/org/apache/http/nio/client/HttpAsyncClient.java) for authentication. It would be best to look for answers on how to configure the credentials by looking at the `HttpAsyncClient` code. [Here](https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/_basic_authentication.html) is an example of how to do basic auth, but it will likely be different for configuring OAUTH.
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### Author:  [@mc1392](https://discuss.elastic.co/u/mc1392)
#### Post date: [January 18, 2019, 7:46pm UTC](https://discuss.elastic.co/t/acquiring-a-token-using-advanced-rest-client/163939/3 "2019-01-18T19:46:51Z")
Issue is resolved.
All the confusion started with me needing to upgrade my elastic instance.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [February 15, 2019, 7:47pm UTC](https://discuss.elastic.co/t/acquiring-a-token-using-advanced-rest-client/163939/4 "2019-02-15T19:47:15Z")
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