On 01/29/14 14:26, Adrian Chadd wrote:
> On 29 January 2014 13:51, Colin Percival <cperc...@freebsd.org> wrote:
>> FWIW, the performance problems with proxies are limited to HTTP proxies
>> which don't speak HTTP/1.1.
> Did you / others ever actually benchmark this?

The fact that performance sucks when proxies break HTTP pipelining?  Yes,
but it's also implied by the RTT/request limit for non-pipelined requests.

> I know that Squid supports pipelined requests but only a handful
> (defaulting to 1) at a time, as the actual error semantics for
> HTTP/1.1 pipelining wasn't well defined.

I'm not sure what the poorly defined error semantics are, but I suppose
that doesn't matter.  Does Squid now reply with HTTP/1.1 headers?  The
phttpget code won't even try to pipeline requests unless it sees that --
as required by the HTTP specification.

> So flipping it around - which intermediaries that are actually in use
> by companies and such actually support pipelining at the level that
> you're doing it?

I don't know.  People usually don't tell me when things work.

Colin Percival
Security Officer Emeritus, FreeBSD | The power to serve
Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid
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