Retrofit: Alt-Svc is a list not a dictionary

[LPardue]

The field is a list where each tuple could share the same "key", and the order of tuples is a preference. Example from RFC 7838

The Alt-Svc field value can have multiple values:

Alt-Svc: h2="alt.example.com:8000", h2=":443"

[martinthomson]

Alt-Svc fits poorly in either.

As a list, the =":443" part doesn't fit the grammar:

sf-list       = list-member *( OWS "," OWS list-member )
list-member   = sf-item / inner-list

As a dictionary, the potential for the same value to be used multiple times doesn't fit this:

There can be zero or more members, and their keys are unique in the scope of the Dictionary they occur within.

[LPardue]

Yeah you're right. To do things right would probably call for mapping. Cookies has similar issues and defunes a mapping https://httpwg.org/http-extensions/draft-ietf-httpbis-retrofit.html#section-3.4

However, given the WG spent some time discussing killing of Alt-Svc maybe we shouldn't bother?