Re: How to reset ALTSVC

[Bence Béky <[e-mail]>]

Hi,

> Some more discussion here is here:
> https://github.com/httpwg/http-extensions/issues/16

Thanks for the clarification.  I'm sorry I missed the discussion on GitHub.


>> Also, since "clear" clears entries including the ones in the same
>> header, why could there be multiple alt-values?  Would instead of
>>
>> Alt-Svc       = 1#alt-value
>> alt-value     = clear / ( alternative *( OWS ";" OWS parameter ) )
>>
>> the following:
>>
>> Alt-Svc       = clear / 1#alt-value
>> alt-value     = alternative *( OWS ";" OWS parameter )
>>
>> not make more sense?
>> ...
>
>
> It would, but we are constrained by the HTTP header field semantics. A header field value is either list-shaped or it is not. We can't choose based on the field contents.

Okay, that makes sense, thank you for the explanation.  Bummer.

By the way, if I understand correctly, "Alt-Svc = clear,
syntactically-inv\"alid-alt-value" would need to be ignored entirely
because it contains an alt-value which does not conform to the
grammar.  However, chances are that there will be implementations that
ignore the second alt-value as soon as they parse "clear".  Probably
does not make much difference though.

Cheers,

Bence