Customizable Request Client for URL Sourced Credentials

[sai-sunder-s]

We have a customer interested in using URL-sourced credentials, but they must have the capability to modify the reqwest client to append kerberos headers.

[coryan]

I think this is a dup of #2194 . Do you mind checking and if not, explaining the difference?

[sai-sunder-s]

I believe the customer needed two things:

• A way to pass the kerberos header in the subject token request. They mentioned they do this in other languages they use through the configurable requests exposed by the library.
• Use openssl instead of rustls. #2194 covers this.

I do not believe supporting openssl alone is sufficient for them to use kerberos. We would have to check with them to understand their requirement/scenario better.

[coryan]

Ack, thanks.

[sai-sunder-s]

Supported through Programmatic Sourced Credentials implemented in #2541