fix: java 17 authentication

[butchyyyy]

In Java 17, the authenticator is invoked with SERVER requestor even when the initial request is performed and even tho we provide the preemptive authorization via header.

Since our authenticator implementaiton did not provide credentials for SERVER requestor, only for PROXY, the message sending would crash with java.io.IOException: No credentials provided error.

Fixes #40

Testing done

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