preconnect link relation and ALTSVC frame

[Lucas Pardue <[e-mail]>]

Hello,

Reading around the Web Linking [1] topic a bit, I came up with the following scenario involving preconnect [2]. My general question is, could a client act on Alt-Svc information during its preconnect action (and if so, do any implementations do this). I wondered if anyone had been on this thought journey and had an opinion.


  1.  Client makes a request for https://example.org/foo
  2.  Server responds with foo resource and Link header:
     *   Link: <https://bar.example.org>; rel=preconnect
  3.  Client attempts to initiate a preconnect and performs full connection handshake.
     *   During TLS handshake, ALPN selects H2
  4.  Connection is established and server sends an ALTSVC frame containing an Alt-Svc-Field-Value of:
     *   hq=":50781”, h2=”baz.example.org”
  5.  Client attempts to establish connection to one of the alternatives?

Regards
Lucas

[1] https://tools.ietf.org/html/rfc8288
[2] https://www.w3.org/TR/resource-hints/#preconnect




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