Re: [art] Revising BCP56: On the use of HTTP as a Substrate

Adam Roach <adam@nostrum.com> Sat, 15 July 2017 09:20 UTC

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To: Mark Nottingham <mnot@mnot.net>, art@ietf.org
Cc: Patrick McManus <mcmanus@ducksong.com>, Alexey Melnikov <alexey.melnikov@isode.com>
References: <83273F06-63D3-41C1-BC3C-9ECE401C2279@mnot.net>
From: Adam Roach <adam@nostrum.com>
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Date: Sat, 15 Jul 2017 11:20:40 +0200
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Subject: Re: [art] Revising BCP56: On the use of HTTP as a Substrate
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I found 4.3.2 particularly interesting, as there doesn't seem to have 
been consensus in this space in the past. For example, the ws(s) and 
ipp(s) schemes made a different decision. I presume your assertion is 
that, were we defining these protocols today, they would be using 
http(s) instead?

I don't see anything wrong with that; I just want to probe the edges of 
this advice by seeing how it would have applied to decisions we made in 
the past, since that's a pretty good predictor for how it might apply in 
the future.

The advice in 4.3.3 seems a bit strong, in that it will require whatever 
process listens on port 443 to take on an ever-increasing role. If we're 
going to keep this advice, I think the document needs some treatment of 
the software architecture implications: functionally, whatever listens 
to port 443 will need to be able to delegate sub-trees of the URL space 
to other processes. I know that some web servers have mechanisms to 
handle this kind of thing today; but we're effectively saying that this 
will become required base functionality for web servers moving forward.

I wonder, in that context, whether the current advice strikes the right 
balance.

/a

On 7/11/17 06:14, Mark Nottingham wrote:
> A number of folks have recently noted that BCP56 addresses the problems of using HTTP for protocols in the early 2000's, but we've moved on considerably since then.
>
> Given the number of IETF protocols being build upon HTTP these days, it seems timely to reconsider it. I've been working on a candidate for replacing it for a little while; see:
>    https://tools.ietf.org/html/draft-nottingham-bcp56bis
>    https://mnot.github.io/I-D/bcp56bis/
>
> I have a small-ish slot in the HTTP WG session on Wednesday to discuss this.
>
> Cheers,
>
> --
> Mark Nottingham   https://www.mnot.net/
>
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