Comments (3)
I'm starting to question if the proposed do-HEAD-then-GET is needed for practical purposes (although I haven't looked into the Docker registry protocol.) If HEAD does not return 2xx for the given digest, it can never mean the registry has the blob in question. I think the only gain with the second GET is that we can verify if the server is really saying the given digest is absent or the server is not well-behaving. But even when the server is not well-behaving, we are checking the code 404, so we will halt and surface other non-404 and 2xx responses immediately. Not to mention 404 seems enough to over-approximate the absence of the blob. Even if 404 was due to a server malfunctioning, the subsequent pushBlob()
will surface a problem.
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However, this might matter if we are going to have a complete registry client library. I don't know.
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As I said earlier, I think we are fine to not implement the proposed do-HEAD-then-GET in practice.
However, we have some code around this including a TODO, so we need to clean them up.
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