Case-Insensitive Response Compression May Cause Problems With Mixed-Case Data and Non-Conforming Clients

Tony Finch dot at
Mon Feb 10 16:25:01 UTC 2014

Paul Vixie <paul at> wrote:
> Tony Finch wrote:
> > ...
> >
> > If you later create positive cache entries under these labels (by asking
> > for SRV) you get the first answer back with canonical case (because it is
> > copied from the authoritative answer) but subsequent answers from the
> > cache use the same case as the negative cache entry.
> i recommend that this be solved with a 2181-bis that adds label
> credibility to its section 5.4.1.

Another thing I wonder about is what happens on authority servers with
zones like below. But I gather Mark already has some possible solutions in

silly.example  A

But making this much effort to preserve case seems contrary to RFC 4343.

f.anthony.n.finch  <dot at>
Forties, Cromarty: East, veering southeast, 4 or 5, occasionally 6 at first.
Rough, becoming slight or moderate. Showers, rain at first. Moderate or good,
occasionally poor at first.

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