Re: Question regarding HTTP/2, SNI, and IP addresses

Stephane Bortzmeyer <bortzmeyer@nic.fr> Wed, 23 June 2021 08:35 UTC

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Date: Wed, 23 Jun 2021 10:30:46 +0200
From: Stephane Bortzmeyer <bortzmeyer@nic.fr>
To: Martin Thomson <mt@lowentropy.net>
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Subject: Re: Question regarding HTTP/2, SNI, and IP addresses
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On Tue, Jun 22, 2021 at 10:55:08AM +1000,
 Martin Thomson <mt@lowentropy.net> wrote 
 a message of 20 lines which said:

> > The TLS implementation MUST support the Server Name Indication (SNI) [TLS-EXT] extension to TLS. If the server is identified by a domain name [DNS-TERMS], clients MUST send the server_name TLS extension unless an alternative mechanism to indicate the target host is used.
> 
> -- https://httpwg.org/http2-spec/draft-ietf-httpbis-http2bis.html#section-9.2-2
> 
> Is that clearer?  There is also similar updates to the HTTP core documents.
> 
> The intent was never to prohibit the use of IP addresses as
> authority.

What are the possible "alternative mechanisms"?