Re: How to reset ALTSVC

[Mark Nottingham <[e-mail]>]

> On 2 Apr 2015, at 10:02 am, Ryan Hamilton <[e-mail]> wrote:
> 
> On Wed, Apr 1, 2015 at 9:24 AM, Martin Thomson <[e-mail]> wrote:
> On 1 April 2015 at 05:11, Bence Béky <[e-mail]> wrote:
> > I think the simplest way to say "the alternative services for this
> > origin is the following list: {empty list}" is to say "{empty list}"
> > instead of "{one item identical to origin, which is understood to have
> > the special meaning that it's an empty list}" or "{one item with valid
> > but arbitrary port and a special, otherwise unused value for ma, which
> > is understood to have the special meaning that it's an empty list}".
> 
> That argument only makes sense if you don't consider the origin to be
> a validate alternative.  That it's implicit and always present isn't
> of much consequence.
> 
> That's surprising to me. As I read the spec, Alt-Svc is all about specifying different ways to reach a server:
> 
>    ...document specifies "alternative services" for HTTP, which allow
>    an origin's resources to be authoritatively available at a separate
>    network location
> 
> 
> To me, that does not imply that the origin is present in the list of alternatives. If the origin is implicitly in that list, should Alt-Svc-Used be sent when using it? That doesn't seem reasonable to me, which makes me think that the origin really isn't implicitly part of the Alt-Svc list.
> 
> Am I thinking about this the wrong way?

Well, literally speaking it’s not an alternative; it’s the authority (the thing that alt-svc provides alternatives *to*). 

It *is* in the list of “places I can get stuff for this origin from”, however.

Cheers,

--
Mark Nottingham   https://www.mnot.net/