It's useful if you have multiple FCGI programs that handle different kinds of requests. Depending on what's being requested, programs start up and shut down.
replyI had to argue about inetd while poking at AI stuff on my home computer. https://en.wikipedia.org/wiki/Inetd ... yeah, there's better modern equivalents, but it seems like we're coming full circle with lambdas and cgi. The concept of dynamically scaling has been around a looong time in UNIX, and we lost it for a bit with big honking java monolith servers.
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