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Re: New Version Notification for draft-toomim-httpbis-versions-00.txt

Michael Toomim <toomim@gmail.com> Thu, 25 July 2024 09:37 UTC

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From: Michael Toomim <toomim@gmail.com>
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Subject: Re: New Version Notification for draft-toomim-httpbis-versions-00.txt
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Julian:
> Michael Toomim:
>> ...
>> The main problem with ETag, though, is that it marks *unique content*
>> rather than *unique time*. If you mutate the state of the resource from
>> "foo" to "bar" and then back to "foo", you'll revert to the same ETag,
>> even though this is at a different point in time. This breaks
>> collaborative editing algorithms.
>> ...
>
> It doen't have to be implemented that way. For instance, AFAIR,
> Subversion just uses the version number as Etag, and that's just fine.

Ah, good catch!

We do need a semantic for "a point in time", but it's true that instead 
of introducing a new "Version" header, we could also introduce a header 
or parameter syntax that constrains the meaning of the ETag header. 
However, ETag would also need to support a list of strings, instead of a 
single string, to represent merge versions from time to time.

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