Why Nginx Doesn't Implement FastCGI Multiplexing?

[momyc]

Consider Comet application (aka long-polling Ajax requests). There is no
CPU-load since most of the time application just waits for some event to
happen and nothing is being transmitted. Something like chat or stock
monitoring Web application used by thousands of users simultaneously.

Every request (one socket/one port) would generate one connection to backend
(another socket/port). So each request would take two sockets or theoretical
limit is approximately 32K simulteneous requests. Even using keep-alive
feature on backend side does not help here since connection can be used by
another request only after current one is fully served.

With FastCGI connection multiplexing we can effectively serve twice as many
requests/clients.

Of course, there are applications that are limited by other resources rather
that sockets/ports.

Is it really so difficult to implement?

P.S. I remember when some people were saying that keep-alive feature for
FastCGI backends side would be pointless.

P.P.S. English is not my first language. Please accept my sincere apologies
for making offencive statement. I did not mean to do so.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,237158,241042#msg-241042