I wonder if something like micro_httpd is technically snappable, if so, how?
DISCLAIMER: I have zero experience in inetd, etc.
you can always cheat … 
(this is a very old snap (originally created during the 15.04 cycle), nowadays you might be able to simply use systemd’s socket activation for your daemon entry in snapcraft.yaml)
https://github.com/ogra1/packageproxy/blob/master/run-approx#L25
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