in reply to Re: Reverse download protocols
in thread Reverse download protocols [solved]

Of course reduction of down link is what I meant - corrected for you.

And no shared information can be assumed. Think of it as operating on a popular download server, where the file to be downloaded can be anything.

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Re^3: Reverse download protocols
by jdporter (Paladin) on Aug 30, 2021 at 15:15 UTC

    Can you explain what you mean by "questions" and "answers", and how those would affect the download?

[reply]
      That's the whole thing, don't get me wrong... What are reasonable client questions here? The client has to guess the file. So it may ask for something like a hash (as in sha1). Then the server answers yes/no, or gives some hint. So it probably involves some hashing algorithm. I'm not sure...
[reply]

        It almost sounds like you are talking about caching. If that's the case then there is no need at all to reinvent that particular wheel. See (eg) the If-Modified-Since and Cache-Control headers.

        🦛

[reply]

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