Pass through error messages from AuthFromMD for debugging #1960
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See #1957 -- requests though the GRPC gateway don't seem to have proper auth (returning
codes.Unauthenticated
, but we're not providing anything more useful in terms of error message to distinguish different cases.I'd really love it if I'd written tests for
UnaryAuthorizationInterceptor
earlier, but I compounded the technical debt here to get the quick fix in.