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Re: The use of binary data in any part of HTTP 2.0 is not good

From: Mark Nottingham <mnot@mnot.net>
Date: Mon, 21 Jan 2013 11:05:50 +1100
Cc: "Adrien W. de Croy" <adrien@qbik.com>, Pablo <paa.listas@gmail.com>, HTTP Working Group <ietf-http-wg@w3.org>
Message-Id: <3EFE45C2-8147-432C-8D15-7E8C5AEC39DC@mnot.net>
To: William Chan (陈智昌) <willchan@chromium.org>
It was discussed in terms of disabling it at the sender, not through negotiation, so I don't think the case you're talking about is going to be a problem.


On 21/01/2013, at 10:55 AM, William Chan (陈智昌) <willchan@chromium.org> wrote:

> Maybe it falls upon me to be the voice of concern here :) Depending on
> what a "debug" option entails, I'm worried about it being used to
> disable a performance feature. As an example of how options can be
> dangerous, we've seen intermediaries that strip out Accept-Encoding
> headers in order to force responses to be uncompressed (probably so
> they can inspect the payloads more easily/cheaply), which is an issue
> from a web performance perspective.
> 
> Back to the use case, if you're in a position to use the debug option,
> is it likely that you would not also be in a position to capture
> enough to decode? I'd like to understand the use case so I can
> properly weigh the benefit of such an option, in contrast to the cost
> that I highlighted above.
> 
> On Sun, Jan 20, 2013 at 3:48 PM, Mark Nottingham <mnot@mnot.net> wrote:
>> 
>> On 21/01/2013, at 10:38 AM, "Adrien W. de Croy" <adrien@qbik.com> wrote:
>> 
>>> 
>>> the thing that will make debugging harder won't be binary vs text, but the inter-dependence of messages.  Especially when it comes to looking through debug logs for issues.
>>> 
>>> On-the-wire, you already need to piece together a TCP stream to see what's going on, so having http messages effectively split over multiple frames (e.g. delta encoding, or compression) only becomes a problem when you don't capture enough to decode.
>>> 
>>> I think it might be worth-while specifying a requirement for a "debug" option for senders of binary messages which turns off all other optimisations, such as caching unchanged headers etc (so they are sent every time).  Just an idea.
>> 
>> That's been brought up a few times, and the reaction has been pretty positive.
>> 
>> Cheers,
>> 
>> 
>> --
>> Mark Nottingham   http://www.mnot.net/
>> 
>> 
>> 
> 

--
Mark Nottingham   http://www.mnot.net/
Received on Monday, 21 January 2013 00:06:20 GMT

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