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Improve error message when clientViaApplicationDefaultCredentials fails to log in#574

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Improve error message when clientViaApplicationDefaultCredentials fails to log in#574
rrousselGit wants to merge 1 commit intogoogle:masterfrom
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Fixes #572

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I'll admit, I'm not sure how to test that. Any suggestion?

@rrousselGit
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@kevmoo Gentle bump :)
Nothing urgent don't worry

return await clientViaMetadataServer(baseClient: baseClient);
} on Exception catch (err, stack) {
Error.throwWithStackTrace(
Exception(
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Hrm...I hate losing the original exception details. I like this idea, though.

Do we have a standarding "inner error" thing somewhere here?

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In our case the error will be a "Failed lookup" error. I'm not sure there's a lot of value.
The stacktrace is preserved, so it should point to what originally threw

I'm not sure how we'd better preserve the chain of error. I'm not aware of an official Dart solution to this problem.
In JS we have that cause field`, but not in Dart? 🤔

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The error message when clientViaApplicationDefaultCredentials fallbacks to reading metadata servers (and failing) is cryptic

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