On: Inside Firefox’s DNS-over-HTTPS engine

[zaarn]

In most Linux setups the resolver is the libc which means each application does have it's own resolver (though commonly dnsmasq or systemd-resolved is used as a local resolver/proxy for DNS). Libc also implements all the stuff around /etc/resolv.conf and /etc/hosts.

[vetinari → zaarn]

While the resolver is in glibc, it is in the form of nss modules. This is one of the primary reasons, why you cannot compile statically with glibc.