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There is big difference between a keepalive (apache) and a websocket.
A keepalive may die ...
I'm not just talking about keepalive "on". I'm talking about Timeout "nnn", and KeepAliveTimeout "nnn". The browser and the server will maintain persistent connections for the duration of "nnn", which can be as long as you want.
If a browser issues an asynchronous request via XHR, and the socket times out on the server, the browser will just get an empty response after minutes or hours of wait. Just code to cycle another request.
a WS remains open except in case of an error and is bi-diectional.
I still stand by my earlier assertion that WS is implementing a request-response cycle under the covers.
Consider the following proof of concept which simulates 4 chat clients establishing 4 persistent connections using XHR. If you use a tool like Fiddler to measure the interval between the 1st response and the 4th response, it often is withing a millisecond or two on a LAN.
http://www.radile.com/rdweb/temp/meet.html
-Nathan
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