I was also surprised he doesn't mention this. One thing that holds true, however, is that a browser won't make another request to a single server if two reques

I was also surprised he doesn't mention this. One thing that holds true, however, is that a browser won't make another request to a single server if two requests are still outstanding. So if, say, you have a COMET connection open and a long running server side AJAX request, none of your other AJAX requests will run. This might make the interface appear to hang, regardless of how many connections your web server can handle. I would say the general idea of returning quickly is probably a good one. I'm sure a lot of you have seen this already, but I love it: http://www.sics.se/~joe/apachevsyaws.html http://www.sics.se/~joe/apachevsyaws.html