How to call REST service in client application with authentication?

Hello! Following the documentation of the Crux Framework you can see an immense ease in calling a third-party REST service by the client application using Crux. But when the server application has OAuth security, is there a way to implement this authentication in the client application using Crux? I'm getting familiar with this security issue but I find it very important. I'm looking for a documentation or some example that I implement in this way. Or the correct way would be to implement in my server application and consume from there? Thanks!