Simon WillisonJun 30, 2023
Figured out how to get anything.lan (including foo.bar.lan etc) to resolve to 127.0.0.1 on my Mac laptop, using dnsmasq installed from Homebrew https://til.simonwillison.net/macos/wildcard-dns-dnsmasq
Local wildcard DNS on macOS with dnsmasq

I wanted to get wildcard DNS running on my Mac laptop, for development purposes. I wanted http://anything.mysite.lan/ to point to my localhost IP address.

Show threadSimon WillisonJun 30, 2023
... and it turns out that's not necessary at all, because `foo.bar.localhost` resolves to `127.0.0.1` on macOS (and Linux) out of the box!
Show threadGlyph

@simon Uhhhh…

$ python3 -c 'import socket; print(socket.getaddrinfo("foo.bar.localhost", 0))'

Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/socket.py", line 962, in getaddrinfo
for res in _socket.getaddrinfo(host, port, family, type, proto, flags):

socket.gaierror: [Errno 8] nodename nor servname provided, or not known

Jun 30, 2023 at 5:00pmWeb
Show threadMark EichinJun 30, 2023
@glyph
.localhost is a feature of *chrome* and nothing else (not even other browsers, as far as I can tell.)
@simon