[Webkit-unassigned] [Bug 160504] Localhost subdomains don't work

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160504

Michael FIG <michael+webkit at fig.org> changed:

           What    |Removed                     |Added
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                 CC|                            |michael+webkit at fig.org

--- Comment #16 from Michael FIG <michael+webkit at fig.org> ---
It seems from my testing that Safari uses macOS's default DNS resolution for `*.localhost`, which goes like:

1. check /etc/hosts (which doesn't support wildcards)
2. use the default network DNS server, provided by the network interface settings

This number 2 step is dependent on the good graces of your ISP or router hardware.  Mine happens to resolve `*.localhost`, but that seems to be hit-and-miss, and unrelated to the client macOS version.

You can check yours with `dig example.localhost` for your default DNS server, or `dig @1.1.1.1 example.localhost` for an explicit query to a specific DNS server (like `1.1.1.1` or `8.8.8.8`).

Failed queries look like `status: NXDOMAIN`.  Success has `status: NOERROR` and an `ANSWER SECTION:` with `example.localhost <expiry> IN A 127.0.0.1`.

As mentioned earlier, Firefox and Chromium-based browsers have builtin code that bypasses the default resolution for `*.localhost` and always return `127.0.0.1` in that case.

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