Adding a new custom interceptor in the STS Async SDK

[nickjosph]

Hello Team,
As part of using the Alicloud auth method in Hashicorp vault, it was advised to add a new request interceptor and the intercept the request to obtain the headers as well as the request URL. Unfortunately, I do not find a way to add a new interceptor in the already existing interceptor chain (builder classes do not have any public methods or the classes are final which prevent extending them). Is there any way in which we can add a new custom interceptor?