Re: Only 2 concurrent connections with window.open()?
From: Chris Barber (chris_at_blue-canoe.co.uk.NOSPAM)
Date: 03/17/04
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Date: Wed, 17 Mar 2004 20:33:18 -0000
Each instance of IE is (by HTTP standards) limited to 2 http 'connections'.
You can change this in the registry (not sure where anymore).
Your first scenario creates four windows three of which are just new window
instances from the same common instance of IE.
Your second scenario creates four instances of IE each of which can have 2
connections.
Chris.
"sherard" <sherard@nospam.nospam> wrote in message
news:13F16B4F-8A51-4C34-A7F6-5D24556F73EE@microsoft.com...
I have noticed some odd behaviour and am hoping that someone has a
resolution.
I am using client side JScript in Internet Explorer 6 SP1 to use a page to
open up 4 new browser windows, using window.open(), with each new page
navigating to the same URL (an ASP page).
An example of the client-side code would be as follows:
var URL = "http://myserver.com/mywebpage.asp";
for (var i=0; i<4; i++)
{
var newWin = window.open(URL);
newWin.focus();
}
4 new browser windows get opened as expected, and it is evident that all are
trying to access the required URL. However. by monitoring the perfomance
counters on the Web server (IIS 5, Windows 2000 SP 3), I can see that only 2
requests get serviced at any one time, with two of them being serviced when
the original two have finished. I have observed this behaviour using the
Active Server Pages 'Requests Executing' and 'Requests Queued' counters on
the server. An important point to note is that the Requests Queued counter
always reads 0, and it is almost as if only two requests are made by the
client browser at any one time, i.e. they never reach the web server until
the first two have finished.
However, when I MANUALLY open up 4 different browser windows on the client
machine, and navigate to the same URL in all of them and at the same time,
all 4 get processed simultaneously (again I can see them all executing using
the 'Requests Executing' counter), which leads me to believe that it is a
problem with the client browser or the window.open() mechanism, and nothing
to do with the Web server.
The Web server is set to receive unlimited connections. The Web site is also
set to use Windows Authentication, but I have tried setting it to Anonymous
User as well and it makes no difference to the behaviour.
Does anyone know how to resolve this?
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