Re: Dnsdir last call review of draft-ietf-httpbis-alias-proxy-status-05

Very helpful. Thanks Tommy!

On Mon, Oct 23, 2023, 3:57 PM Tommy Pauly <tpauly@apple.com> wrote:

>
>
> On Oct 16, 2023, at 10:50 AM, Rory Hewitt <rory.hewitt@gmail.com> wrote:
>
> Hopefully not too late to bring this up, and it's really just a nit...
>
> At the end of Section 2.1 in
> https://www.ietf.org/archive/id/draft-ietf-httpbis-alias-proxy-status-05.html,
> there is this:
>
> It is also possible for a DNS name to include a period character (".")
> within a label, instead of as a label separator. In this case, the period
> character MUST be first escaped as "\.". Since the "\" character itself
> will be percent-encoded, the name "dot\.label.example.com" would be
> encoded within a next-hop-aliases parameter as follows:
>
> Proxy-Status: proxy.example.net; next-hop="2001:db8::1";
>
>     next-hop-aliases="dot%5C.label.example.com <http://5c.label.example.com/>,service1.example.com"
>
> Upon parsing this name, "dot%5C.label" MUST be treated as a single label.
>
> Similarly the "\" character in a label MUST be escaped as "\\". Other uses
> of "\" MUST NOT appear in the label after percent-decoding.
>
>
> <https://www.ietf.org/archive/id/draft-ietf-httpbis-alias-proxy-status-05.html#section-2.1-4>
>
> <https://www.ietf.org/archive/id/draft-ietf-httpbis-alias-proxy-status-05.html#section-2.1-5>
>
>
> <https://www.ietf.org/archive/id/draft-ietf-httpbis-alias-proxy-status-05.html#section-2.1-6>
>
> Can that last line be expounded on and clarified? Will a "\" character in
> a label be 'eventually' encoded as "\\" or "%5C%5C" or some combination of
> them?
>
>
> Rory
>
>
> Yes, we could give an example to show the encoded “%5C%5C”. I’ve filed
> https://github.com/httpwg/http-extensions/issues/2665.
>
> Thanks,
> Tommy
>