On 11/21/24 12:41, Murray S. Kucherawy wrote:

On Wed, Nov 20, 2024 at 6:48 PM Brotman, Alex <[email protected]> wrote:

    * Section 2.6.2 requires gzip.  What about other methods like zstd
    which can provide better compression?

    This is the first time that has been asked.  I suppose it could be
    changed, though, it seems as though it would break existing report
    ingestion.   Are zipped reports large enough to benefit?


The reason I bring it up is because compression mechanisms more modern than gzip, such as Brotli and zstd, have been published as RFCs since RFC 7489, so I wonder if there would be any advantage to allowing those.  If there's never been any need and we're satisfied with gzip, that's fine.  I just figured I'd ask the question.


I'd be happy not to lock everything into gzip for the next X years, but can we allow flexibility without creating an issue for existing code? We could add something like (completely off-the-cuff) "+zstd" or "+brotli" at the end of the "rua=" value, and if neither of those are present you stick to gzip?

That'd have to go into the DMARCbis draft with the notation, allowed values, and RFC references... Worth the effort?

--S.


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