Re: [quicwg/base-drafts] ALPN Tokens and Alt-Svc (#90)

[Martin Thomson <[e-mail]>]

martinthomson commented on this pull request.



>  
-On receipt of this header, a client may attempt to establish a QUIC connection
-on port 443 and, if successful, send HTTP requests using the mapping described
-in this document.
+This document defines the "v" parameter for Alt-Svc, which is used to provide
+version-negotiation hints to HTTP/QUIC clients. Syntax:
+
+    v = quoted-versions
+    quoted-versions = DQUOTE *( version-string "," ) version-string DQUOTE
+    version-string = token; percent-encoded QUIC version
+
+For example, if a server supported both version Q033 and Q034 it would specify
+the following header:
+
+    Alt-Svc: hq=":443"; v="Q034,Q033"

A note to discuss version representation:

You have a character string, I chose to go with just numbers.  Both have merits.  Numbers are simpler, but potentially longer (hexadecimal saves a few octets for larger values if you want to go there), but a four character string can be quite friendly.  You have to pick the right values though or you get a mash of %xx strings.

`Alt-Svc: hq=":443;v=<version>;v=<version>` might be better than creating a micro-syntax for the list.  See also httpwg/http-extensions#281

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