Controlling & inform ALPN protocol

[jimmywarting]

Just like reading status, statusText and final url i also wish there where a protocol information on Response object itself.
i want to know if the network call that was used when fetching some resource did decide to use http/1.1 http/2 or any other.

likewise i which i could also control what protocol should be used or sending a preferred ordered. most gRPC applications do not support http/1.1 which is the default protocol being used with fetch stuff with standard fetch api.

A gRPC service i used did support both both 1.1 and 2
But when i made a request with fetch to that server, it responded with 426 status saying basically saying: http/1.1 is not supported, use h2 instead

if it had only supported h2 then that would have been a different story

i which i could do something like

new Request(url, { 
  // working similar to Content Negotiation headers
  protocol: "http/2=1; http/1.1=0.5, */*;q=0.2",

  // or
  protocol: ['h2', 'http/1.1', '*']
})