[Twisted-web] Implementing hanging get with twisted web

joe kim joe.kim at gmail.com
Sun Nov 12 00:38:45 CST 2006

On 11/11/06, Jean-Paul Calderone <exarkun at divmod.com> wrote:
> On Sat, 11 Nov 2006 11:06:07 -0800, joe kim <joe.kim at gmail.com> wrote:
> >Hi all,
> >
> >I had a question about implementing hanging-gets.  A hanging get is
> >basically when the server "hangs" onto the http request until either a
> >certain period of time or until there is an event is triggered.  It is
> >a hack for implementing event driven messaging on top of HTTP.
> >
> >Alex Russell references it in his blog:  http://alex.dojotoolkit.org/?p=545
> >
> >What's the best way to implement hanging-gets using twisted?  I have a
> >web page that I want to immediately update everytime there is a change
> >to the data.  Making asynchronous javascript requests every second do
> >not really make sense, but I was thinking that if the javascript
> >continually made asynchronous requests to the server and the server
> >implemented hanging-gets, then that would be a good solution.
> >
> >Any thoughts are appreciated.
> See http://divmod.org/trac/wiki/DivmodNevow/Athena
> The basic mechanism in twisted.web which this relies on is a renderHTTP
> method which returns NOT_DONE_YET and arranges for request.finish() to
> be called at some later time.
> Jean-Paul
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Thanks for the link. I was using HTTPFactory, HTTPChannel,
http.Request for my implementation.  I have not tried Athena yet.   I
will give it a try.


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