Re: Redirection to Other IP Addresses

Hi Mark,

Thanks for the reminder. Yes, 312 is just an example. I was sloppy in the
last email to mention this.

Bin

On Tue, Aug 13, 2019 at 6:59 PM Mark Nottingham <mnot@mnot.net> wrote:

> Hi Bin,
>
> Just to make sure -- please don't use status codes without having them
> standardised, and don't use a concrete number in your proposal, as it might
> have to change, which can cause interoperability problems.
>
> From RFC7231 <https://tools.ietf.org/html/rfc7231#section-8.2.2>:
>
> >    Proposals for new status codes that are not yet widely deployed ought
> >    to avoid allocating a specific number for the code until there is
> >    clear consensus that it will be registered; instead, early drafts can
> >    use a notation such as "4NN", or "3N0" .. "3N9", to indicate the
> >    class of the proposed status code(s) without consuming a number
> >    prematurely.
>
> Cheers,
>
>
>
> > On 13 Aug 2019, at 6:09 pm, Bin Ni <nibin@quantil.com> wrote:
> >
> > Hi Erik,
> >
> > Thanks for your thoughts.
> > Since we will use a dedicated status code 312, I think we can simply use
> "cache-control" to set the cache behavior, just like how 30X is handled
> today.
> >
> > Bin
> >
> > On Thu, Aug 8, 2019 at 6:56 PM Erik Nygren <erik@nygren.org> wrote:
> > On Thu, Aug 1, 2019 at 5:21 AM Daniel Stenberg <daniel@haxx.se> wrote:
> >
> > If we for a moment play with the idea that we'd do something like this,
> then I
> > think it should be aligned with and work together with Alt-Svc in a
> better way
> > than what is currently proposed..
> >
> > Agreed that if we go down the Alt-Svc-like-road that this needs to play
> well
> > with Alt-Svc.  A major difference is that Alt-Svc is scoped to Origins
> > (ie, all requests for that Origin are encouraged to use the Alt-Svc).
> > But in this case the scope is presumably for individual URLs.
> > If the client asks for a bunch of different objects it is possible
> > that each one of them might want to be directed to a different
> > alternative service, and some of these might be running in-parallel.
> >
> > It seems like on the Alt-Svc route there are two design questions
> > that must be addressed:
> >
> > 1) How to signal client support
> > 2) How to allow different alternative services to be used for different
> URIs.
> >
> > For #1, maybe there is a new request header?
> "Accept-Redirect-to-Alternative" ?
> >
> > For #2, maybe we allow for labeled alternatives?  For example:
> >
> > GET /abc/foo345678.mp4
> > Host: videos.example.com
> >
> > HTTP/1.1 312 Redirect URI to Alternative
> > Alt-Svc: h2="cdn-node-98765.example.net:443"; ma=3600;
> label="cdn-cluster-98765"
> > Alt-Svc: h3="cdn-node-98765.example.net:443"; ma=3600;
> label="cdn-cluster-98765"
> > Alt-Svc-Location-for-URI: "cdn-cluster-98765"
> >
> > In this case there would be an additional cache of Alt-Svcs keyed by
> {origin,label}.
> > On receiving one of these redirects, a client supporting this
> synchronously look for
> > a connection to an Alt-Svc keyed by {"https://videos.example.com
> ","cdn-cluster-98765"}
> > and then re-issue the request there (sending along the Alt-Used request
> header as well
> > which would somehow want to include the label used.
> >
> > Presumably other URIs for the origin would not use the labelled Alt-Svc
> unless
> > specifically redirected.
> >
> > Another way to handle #2 would be to allow Alt-Svc to be scoped to URI
> patterns,
> > so the "synchronous redirect to alternative" could include a set of
> Alt-Svc
> > entries with:    scope="/abc/*"
> >
> > That said for the above, I think that something along the lines of an
> out-of-band
> > encoding solves a bunch of these use-cases in a more flexible manner.
> > Alt-Svc requires the alternatives all have the same degree of trust.
> > Being able for an origin to say "get the bytes from this other URL but
> > use integrity-validation and decryption information provided as part
> > of this response" opens up many more use-cases.
> >
> >        Erik
> >
> >
> >
> >
> >
> >
> >
> > --
> > Bin Ni
> > VP of Engineering
> >
> >
> > Connecting users with content...it's that simple.
> > Office: +1-888-847-9851
> >
> >
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> >
> >
>
> --
> Mark Nottingham   https://www.mnot.net/
>
>

-- 

Bin Ni
VP of Engineering
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