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Re: [gears-eng] Re: [google-gears-eng] Re: Deploying new expectation-extensions

From: Charles Fry <fry@google.com>
Date: Fri, 19 Sep 2008 10:28:13 -0400
Message-ID: <b549193f0809190728p204c237fo6e7398bfcf440ead@mail.gmail.com>
To: "Mark Nottingham" <mnot@yahoo-inc.com>
Cc: "Jamie Lokier" <jamie@shareable.org>, "Brian McBarron" <bpm@google.com>, gears-eng@googlegroups.com, "Julian Reschke" <julian.reschke@gmx.de>, "Alex Rousskov" <rousskov@measurement-factory.com>, "HTTP Working Group" <ietf-http-wg@w3.org>

A few more thoughts on URLs and ETags:

- While it isn't clear in the examples on the wiki page, the initial
handshake is optional. In other words, it represents one extreme end
of the protocol, but the primitive requirement is that unique
identifier (whether URL or ETag) be obtained. This could very well be
present in an HTML page, for example, allowing a resumable upload
without the initial handshake.

 - Regarding ETags vs. URLs, one point of reference for me is CGI
scripts. A single CGI script running behind a fixed URL should (in my
mind) be able to perform a resumable upload, but this would require a
unique identification mechanism other than the URL.


On Wed, Sep 17, 2008 at 18:36, Mark Nottingham <mnot@yahoo-inc.com> wrote:
> OK. I agree that doing it in hardware is more expensive (as you have no
> choice but to involve a vendor), but doing it in software is relatively
> easy; high-performance servers that can act as intermediaries are getting
> pretty common, and pretty performant.
> Cheers,
> On 17/09/2008, at 9:25 PM, Jamie Lokier wrote:
>> Mark Nottingham wrote:
>>>> But I agree that you might be able to use existing URL-based front-end
>>>> load-balancing kit, and that might reduce the cost of implementation
>>>> substantially.
>>> Is there a hidden assumption there that this is done in hardware?
>> No.  By "kit" I mean readily available hardware and/or software, which
>> does URL-based affinity HTTP request forwarding for load balancing.
>> -- Jamie
> --
> Mark Nottingham       mnot@yahoo-inc.com
Received on Friday, 19 September 2008 14:29:03 UTC

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