Comment by supportengineer

Over 20 years ago I worked with some specialized commercial software, Cyclone, that did guaranteed delivery of files. Guaranteed as in the legal sense. If the server sent back a ticket number to the sending client, it was a LEGAL assurance that the file was received, because there was a contract in place with financial penalties. The time stamps were particularly important in the legal contract. So, there are a lot of ways you can have exactly-once delivery, especially when talking about the application level of the 7 layer burrito model.

hinkley a year ago

But you sometimes delivered the bytes twice, before getting the receipt, surely?

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theamk a year ago

I am sure there were some duplicate packets on the wire - it's a normal part of most network protocols. The important thing is that as far as user was concerned, it was exactly-once.

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