RFR: 8372731: Detailed authentication failure messages [v2]

[Daniel Jeliński]

On Mon, 8 Dec 2025 21:56:57 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>> Daniel Jeliński has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fail test if no exception is thrown
>
> Any reason why `getHeaderValue` is not updated the same way? There are several places where the return value is set into a request. I have no memory of the details but it makes me feel uneasy.

Thanks @wangweij for the review. I didn't want to modify any of the existing URLConnection behaviors, and authentication schemes that use `getHeaderValue` do not throw when the function fails. The schemes that use `setHeaders` were already throwing exceptions to user code sometimes, and I augmented these exceptions with additional information.

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PR Comment: https://git.openjdk.org/jdk/pull/28601#issuecomment-3630834374