Re: Concepts to improve Http2.0

On 29 Jul 2016, at 9:50 AM, Amos Jeffries <> wrote:
> On 28/07/2016 6:30 p.m., Poul-Henning Kamp wrote:
>> --------
>> In message <em51dddd7f-de76-4e87-abcb-0f315b115499@bodybag>, "Adrien de Croy" w
>> rites:
>>> The problem with deferring headers in responses to after content, is=20
>>> that proxies often make policy decisions based on response headers, and=20
>>> therefore need these to be all up front.
>>> Trailers for this reason are also a problem
>> We talked about this in the workshop, and yes, trailers *in general*
>> is a problem, but the specific trailers people care about are not.
>> The trailers people ask for, as far as I understood:
>> 	Etag
>> 	Set-cookie
>> 	Cache-Control(/Expires/Age)
>> They are *not* a problem.
> Technically true. But those last three are exceedingly annoying if
> pushed into Trailers. Verging on being an outright attack. Since we
> reserve cache space and do a lot of storage activity before finding out
> whether its actually not cacheable after all. Usually something else
> potentially useful got discarded to make room for it as well.

Trailer: ETag would probably be a good hint about that...

Mark Nottingham

Received on Friday, 29 July 2016 11:08:29 UTC