[nathcd]

> Turns out that CGI is perfect for that : the only process always running are nginx and fcgiwrap, then all my apps are started only on demand, for the lifetime of the request.

This is a really nice idea. It almost makes me wish browsers could just make a local CGI request directly, without a webserver at all. A quick search turns up an extension for ye olde Firefox: https://github.com/RufusHamade/lcgi. I suppose with native messaging APIs it's probably possible with new extension APIs too, if a bit more convoluted.