Re: ext#7 / ext#8: multiple alt-svc

> So far, we see 'q' being paid only scant attention in existing headers;
not sure it'll really be better here. Again, the original scheme did have a
prioritisation mechanism, but the feedback I got was that it's too complex
for no demonstrated gain.

In an enterprise scenario, it could be used to implement reliable and
consistent multi-datacenter HA services: the priority can be used to hint
the client to choose the primary or the closest Datacenter,  and then
balance among a local servers pool.

   Francesco