Hi. There is an increasingly popular technique to emulate server-initiated push over HTTP. I'm sure everyone here knows it well, but for the sake of completeness: the clients sends a XMLHttpRequest to the server in the background; the server does not answer it immediately, but keeps it for later when there is actually something to say to the client; if the request timeouts, the client re-sends it.
I am wondering if this technique is usable with Apache in general and mod_perl in particular. The obvious solution is to have the request handler sleep until it has something to answer does not work, since it requires a worker thread and a perl interpreter for each waiting client, and perl interpreters are few and expensive. The ideal solution would be if some part of the request handler could put the current request (A) "on hold". Later, the handler for another request (B) could retrieve the request A and generate an answer for it, or at least wake it up. Is something like this possible with Apache and mod_perl? Regards, -- Nicolas George
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