x/build/internal/gomote: response code: 502 in TestWriteFileFromURL on darwin/amd64

[bcmills]

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--- FAIL: TestWriteFileFromURL (19.91s)
    gomote_test.go:797: client.WriteFileFromURL(ctx, req) = response, rpc error: code = Aborted desc = unable to get file from URL: response code: 502; want no error
2022/05/02 15:54:19 created buildlet example-linux-amd64-0 for example ()
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FAIL
FAIL	golang.org/x/build/internal/gomote	20.428s

greplogs -l -e 'FAIL: TestWriteFileFromURL' --since=2022-01-01
2022-05-02T21:34:37-477369d-99f1bf5/darwin-amd64-12_0
2022-05-02T21:05:53-477369d-a887579/darwin-amd64-12_0
2022-05-02T20:59:21-477369d-94274d0/darwin-amd64-10_15
2022-05-02T20:59:21-477369d-94274d0/darwin-amd64-11_0

[bcmills]

This test is missing useful test failures — I can't tell from the failure log what URL actually failed, but I suspect it may be related to #51323.

This test was added in CL 397596 (attn @golang/release), and darwin/amd64 is a first-class port, so this is a release-blocker via #11811.

I think for now it would suffice to improve the failure logging enough that we can make further progress should it occur again. (Since the test is new, I don't think that actually diagnosing the failure mode needs to block the release — if it continues to recur and we still can't figure it out, we can add a suitable test-skip instead.)

[gopherbot]

Change https://go.dev/cl/405516 mentions this issue: internal/gomote: fix flaky TestWriteFileFromURL test