SNI Extension for Alt-Svc

[Mike Bishop <[e-mail]>]

I was already planning to spin up a thread on that draft today, so thanks for deciding what I'm doing next today!  😉  Forking a separate thread.



WG, https://tools.ietf.org/html/draft-bishop-httpbis-sni-altsvc-00 proposes a new parameter for Alt-Svc suggesting that a client use a different (presumably generic) hostname in the TLS SNI extension, and instead gain Alt-Svc "reasonable assurances" by requesting the origin's certificate via Secondary Certificates (which is currently under Call for Adoption).  It gives a solution, albeit HTTP-specific, to SNI privacy by providing a discoverability path for which generic hostname can be used to reach a more sensitive origin under encryption.



As to the frame reference, I intentionally didn't reference which protocol, in part because Alt-Svc itself says it can be carried by various mechanisms and the definition of an Alt-Svc extension doesn't need to get into that layer.  The Alt-Svc frame for HTTP/QUIC is specified by https://tools.ietf.org/html/draft-bishop-httpbis-altsvc-quic-00.  While frames are present in both HTTP/2 and HTTP/QUIC, I don't think that makes frames a generic HTTP concept -- it's a property of certain mappings, and specified individually in each of them.



-----Original Message-----
From: Lucas Pardue [mailto:[e-mail]]
Sent: Thursday, November 30, 2017 2:13 AM
To: Mike Bishop <[e-mail]>; [e-mail]
Cc: Mark Nottingham <[e-mail]>; HTTP Working Group <[e-mail]>; Patrick McManus <[e-mail]>
Subject: RE: DRAFT: more details for HTTPtre



Hi Mike,



The connection coalescing case is interesting as it's not currently described in HTTP/QUIC. Presumably by oversight or time constraint rather than intent. (We've got a ticket open tracking that one.)



Changing track, I've just seen your SNI I-D

https://tools.ietf.org/html/draft-bishop-httpbis-sni-altsvc-00



References to Frames don't state a specific mapping (HTTP/2 or HTTP/QUIC). Reading between the lines this seems intentional, which got me thinking that also Frames could be described as a new HTTP semantic for binary-capable wire formats.



Lucas

________________________________________

From: Mike Bishop [[e-mail]]

Sent: 28 November 2017 18:32

To: Lucas Pardue; [e-mail]<mailto:[e-mail]>

Cc: Mark Nottingham; HTTP Working Group; Patrick McManus

Subject: RE: DRAFT: more details for HTTPtre



I agree that HPACK is largely decouplable from HTTP/2, or HTTP.  The core of the protocol is a general-purpose compression algorithm for streaming key-value dictionaries, rather than straight text.  The pieces that bind it to H2 are incidental, and perhaps we could have structured it differently.



Coalescing isn't a new semantic -- each HTTP mapping defines how parallelism and connection reuse should work in that mapping.  HTTP/2 simply happens to define it more expansively than HTTP/1.1.













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