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.localhost Domains

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301 points todsacerdoti | 1 comments | 10 Apr 25 14:19 UTC | HN request time: 0.2s | source
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WhyNotHugo ◴[10 Apr 25 15:14 UTC] No.43644682[source]▶
Any subdomain of .localhost works out-of-the-box on Linux, OpenBSD and plenty of other platforms.

Of note, it doesn't work on macOS. I recall having delivered a coding assignment for a job interview long ago, and the reviewer said it didn't work for them, although the code all seemed correct to them.

It turned out on macOS, you need to explicitly add any subdomains of .localhost to /etc/hosts.

I'm still surprised by this; I always thought that localhost was a highly standard thing covered in the RFC long long ago… apparently it isn't, and macOS still doesn't handle this TLD.

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1. telotortium ◴[11 Apr 25 08:33 UTC] No.43651614[source]▶
It's easy to be tricked into thinking macOS supports it, because both Chrome and Curl support it. However, ping does not, nor do more basic tools like Python's request library (and I presume urllib as well).