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Re: Negotiating compression

From: Greg Wilkins <gregw@intalio.com>
Date: Wed, 28 May 2014 12:19:55 +0200
Message-ID: <CAH_y2NGZQSUFmfvmniXgKsLy220ywpUMrWDh9bezbyc7jWQU-w@mail.gmail.com>
To: David Krauss <potswa@gmail.com>
Cc: "Richard Wheeldon (rwheeldo)" <rwheeldo@cisco.com>, Michael Sweet <msweet@apple.com>, Nicholas Hurley <hurley@todesschaf.org>, Martin Thomson <martin.thomson@gmail.com>, HTTP Working Group <ietf-http-wg@w3.org>
On 28 May 2014 03:59, David Krauss <potswa@gmail.com> wrote:

> I’ve not implemented HPACK, but what works for a big server handling a
> million connections should usually work for a tiny MCU.

Indeed this is very true!

As somebody who has implement a server handling a million connections, I've
very much concerned by the resource requirements implied by HTTP/2 for a
server.   Not only does a server have to commit to storing the headers that
can result from a 16k compressed header frames, but it may receive
unlimited CONTINUATION frames after that.

Sure a server can opt not to accept large headers, but if HTTP/2 is going
to facilitate a web where browsers can and do send such large headers, then
all that would do would be for that server to opt out of the web.

I just do not see the need for the transport meta data channel for HTTP/2
to grow beyond the current size.  After all, we are only trying to support
what is done with HTTP/1.1 now, so 8K headers should be sufficient and any
new applications for large metadata can put it in a data stream!

So with my tin foil hat on, I see conspiracy!) I'm told nobody is going to
send servers such big headers... so why then are going to such lengths to
support them in the protocol?


Greg Wilkins <gregw@intalio.com>
http://eclipse.org/jetty HTTP, SPDY, Websocket server and client that scales
http://www.webtide.com  advice and support for jetty and cometd.
Received on Wednesday, 28 May 2014 10:20:23 UTC

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