Re: HTTP/2 Push deployed on webtide.com

[Mark Nottingham <[e-mail]>]

My .02 - that seems to sum it up pretty well.

Cheers,


On 19 Aug 2014, at 9:55 am, Greg Wilkins <[e-mail]> wrote:

> 
> Note that there is a thread on the Servlet EG list regarding an API for push:
> 
> https://java.net/projects/servlet-spec/lists/jsr340-experts/archive/2014-08/message/1
> 
> where I've been asked some questions to describe "the rationalization used by the httpbis wg"
> 
> Since I can't speak for the WG, I thought I'd echo my thoughts here regarding the push mechanism to check that I'm not misrepresenting anything:
> 	• Push is a server-side coordinated mechanism in as much as the server must decide to push a resourced based only on information that it already has.   Specifically h2 provides no information on the contents or status of downstream caches.   
> 	• Servers are free to innovate push strategies, with some of the following having been suggested:
> 		• Use knowledge from the web application/framework to determine what are associated resources.
> 		• Use heuristics derived from referrer headers and timing to infer what are associated resources
> 		• Use sessions to track what resources a client has requested/received to avoid unnecessary pushes 
> 		• Use the presence of if-modified headers to infer the status of a client cache to avoid unnecessary pushes.
> 	• There are no functional problems other than increased latency of not pushing an associated resource
> 	• There are no functional problems other than wasted bandwidth of pushing an unnecessary resource:
> 		• Clients can reset a pushed stream if they determine it is unnecessary.   Thus is a server attempts to push a resource that is already cached by the client, a RST will prevent wasting too much bandwidth.
> 
> Hopefully nothing controversial or misrepresented there?
> 
> cheers
> 
> 
> 
> On 18 August 2014 18:57, Simone Bordet <[e-mail]> wrote:
> Hi,
> 
> the Jetty team has deployed h2-14 with HTTP/2 Push functionality on
> https://webtide.com, see
> https://webtide.com/http2-push-with-experimental-servlet-api/.
> 
> We are very interested in comments about how to make HTTP/2 Push
> better, so please try it out and tell us (also see discussion bullets
> towards the end of blog post).
> 
> Thanks !
> 
> --
> Simone Bordet
> ----
> http://cometd.org
> http://webtide.com
> http://intalio.com
> Developer advice, training, services and support
> from the Jetty & CometD experts.
> Intalio, the modern way to build business applications.
> 
> 
> 
> 
> -- 
> Greg Wilkins <[e-mail]> 
> http://eclipse.org/jetty HTTP, SPDY, Websocket server and client that scales
> http://www.webtide.com  advice and support for jetty and cometd.

--
Mark Nottingham   https://www.mnot.net/