On Fri, May 24, 2013 at 3:27 PM, Michael Sweet <msw...@apple.com> wrote:
> Kerry, > > On 2013-05-24, at 2:51 PM, Kerry Lynn <ker...@ieee.org> wrote: > > ... > > Just so we're clear, I assume this does NOT work today with link-local > IPv6 addresses (because no print client yet > constructs a Host URI with link-local address and zoneID according to RFC > 6874)? And you're saying that RFC 6874 > does not improve on the current situation? > > > Correct on both counts. > > What we have been advising printer vendors to do for the last 8 years is > to support the IPvFuture address syntax, based on some discussions I had 8 > years ago with one of the HTTP WG members at the time (and I apologize for > not having more details, I lost my email archives recently and haven't been > able to recover the files yet...) The "recommended" syntax at the time was: > > scheme://[v1.fe80::xxxx:...:xxxx+zoneid]:port/path > > So it appears the current 'host' production used by print drivers is not currently specified by any RFC; why not just continue to use the same format irrespective of RFC 6874? > Support for that format got added to CUPS back in 2005, with most current > printers supporting it as well. By printer support, I mean they use the > address as-is when returning URIs, they don't actually care about the > zoneid... > > I've been doing some testing locally and it seems that some OS > libraries/frameworks work with the new address format, some with the old > IPvFuture format, but so far none work with both. > > Another data point: none of the web browsers I've tested allow link-local > IPv6 addresses, period. Some don't understand the IPvFuture or RFC 6874 > formats, some decide you meant to search for the IPv6 address (which > produces some interesting search results...) > > It's the browser case that RFC 6874 was primarily meant to deal with. -K- I still need to do more testing with printers to see what they do with RFC > 6874 URIs once the print client (CUPS) is updated. I suspect it will be a > mixed result... > > _________________________________________________________ > Michael Sweet, Senior Printing System Engineer, PWG Chair > >
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