Atlas 4: Only 2 calls at a time and don't expect any order

re: Atlas 4: Only 2 calls at a time and don't expect any order

jayson knight — Sun, 17 Dec 2006 00:34:03 GMT

See my post here on how to raise the 2 concurrent request limit: http://jaysonknight.com/blog/archive/2004/06/04/277.aspx

Main post is for IE, there is a comment on how to do it in FF.

re: Atlas 4: Only 2 calls at a time and don't expect any order

Jonathan Gill - AMD — Thu, 14 Dec 2006 17:36:32 GMT

You should be able to make more than two calls on a web page at a time by using subdomains (e.g. calling images.pageflakes.com), be careful about security errors with any Javascript though. Caleb Jenkins from Microsoft can/will confirm this.

re: Atlas 4: Only 2 calls at a time and don't expect any order

Marijn Ros — Thu, 14 Dec 2006 17:16:26 GMT

As far as I know, a 2 connection limit is suggested in the HTTP/1.1 specification.

I think it can be raised by the user through a registry setting, but there is a reason for setting it to 2: it is a balance between network load and webserver load combined with the fact that using 1 connection would show the stalls all the time, while with 2 there is at least a way to bypass a large request.

Marijn

BTW: Opera has the connection limit set higher ( 4 or 8, I do not remember), Firefox also defaults to 2 (for HTTP/1.1, I think it is 4 for HTTP/1.0)

BTW2: Using HTTP pipelining, at least the start can coincide with a previous download

re: Atlas 4: Only 2 calls at a time and don't expect any order

Al Borns — Wed, 13 Dec 2006 23:25:50 GMT

The behavior comes from a limitation within WinInet and as far as I know there is no fix, except using another component ;-)

re: Atlas 4: Only 2 calls at a time and don't expect any order

Rachit — Wed, 13 Dec 2006 14:27:16 GMT

Is there anyway to increase the concurrent http connections limit? What are the down side of it if we increase it? Anyways, it's bad idea to call more than 2 requests at a time but when you deal with long running webservices (which takes more than 2-3 seconds), I wonder what else can be done!

re: Atlas 4: Only 2 calls at a time and don't expect any order

Michael Schwarz — Tue, 28 Nov 2006 09:36:26 GMT

Look at my blog where I'm writing about mistakes in AJAX applications. You should never run more than one request at the same time. Not only AJAX requests are queued because of the 2 concurrent http connections restriction, think on mouseover images!

Michael