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From Christopher L Merrill <ch...@webperformance.com>
Subject Re: Basic http-question
Date Fri, 03 Feb 2006 20:26:01 GMT
Jesper Sahner wrote:
> My question is if it is possible - within the "http-framework" - to ask 
> the server to return an answer when it has the answer instead of 
> periodically asking for an answer which is basically waste of time.

HTTP is inherently a request/response protocol.  You could issue a
request and have server wait to respond until the desired data is available.
But the socket would eventually timeout and you'd have to re-issue the
request.  Additionally, it needlessly ties up resources on the server.

> By way of comparison how do Flash-driven websites which are dynamically 
> updated (e.g. stock tickers) work in this context?

At least some of them are polling the server with requests every N seconds.
Some can open raw sockets to the server, but these methods have trouble
getting through firewalls.


Chris Merrill                  |  http://www.webperformance.com
Web Performance Inc.

Website Load Testing and Stress Testing Software

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