Hi Chris,
Thanx for your answer.
From: Christopher L Merrill <[EMAIL PROTECTED]>
Reply-To: "HttpClient User Discussion" <[email protected]>
To: HttpClient User Discussion <[email protected]>
Subject: Re: Basic http-question
Date: Fri, 03 Feb 2006 15:26:01 -0500
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.
I wonder how e.g. a mail-system like Hotmail works. If you are logged in you
get a pop-up message every time a new message is received. Is that pop-up
message the result of your request to the mail-server (guess not) or the
mail-server just telling you that a new message is sent.
I wonder if something similar is possible with HTTP: You make an initial
request telling the server to give you a notice every time a certain event
occurs without making any further requests?
A solution like this would be much more effective that repeatedly requesting
for new events that hasn't occured.
But as I read your answer, HTTP is a request/response protocol, so this is
not possible.
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.
C
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Chris Merrill | http://www.webperformance.com
Web Performance Inc.
Website Load Testing and Stress Testing Software
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