[download] Don't fail on 304 Not Modified

[sathieu]

i.e when file was not modified since last download

What type of PR is this?

/kind feature

What this PR does / why we need it:

If a file is already downloaded, the timestamp of the file is sent to the server which returns 304 Not Modified. Before this PR, this was considered as a failure.

Don't fail on 304 Not Modified for an already downloaded file

[k8s-ci-robot]

Hi @sathieu. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[yankay]

/ok-to-test

[yankay]

Thanks @sathieu
/lgtm

[floryut]

@sathieu Thank you ; lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, sathieu

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[VannTen]

/kind feature