We are very pleased to announce the release of the Auth Client extension version 2.1.0. The main change is that it's now uses the HTTP Client extension providing more sophisticated base for REST API requests.
Note that 2.1.0 introduces significant backwards compatibility break! It is very likely, that existing code based on 2.0.x versions will be unable to function with 2.1.0 without adjustments.
Check the UPGRADE instructions for migration from 2.0.x versions.
Also make sure your composer.json has the necessary version constraint limit if you want to stay with the 2.0.x version, e.g. ~2.0.6. Check the Composer documentation on version constraints to learn how that works.
This release also provides several enhancements, such as support of client_credentials and password authentication grant type for OAuth 2.0. See the CHANGELOG for a complete list of changes.