Bug: `deno serve --host localhost` prints invalid URL about deno HOT 7 OPEN

@marvinhagemeister is this Linux or Mac? It looks like the socket address is being resolved here which is a bit strange.

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@mmastrac I'm on macOS

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Turns out that the issue can be reproduced with Deno.serve alone:

Deno.serve({ hostname: "localhost" }, () => new Response("foo"));

Output:

$ deno run -A foo.ts
Listening on http://::1:8000/

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@marvinhagemeister What do you have in /etc/hosts (cat /etc/hosts | grep "localhost")? Also, do you have IPv6 configured under your network settings?

I wonder if this is a weird IPv6 resolution thing.

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The default host file on macOS looks like this:

##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1       localhost
255.255.255.255	broadcasthost
::1             localhost

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Just ran into this on Windows. In v1.42.3 it prints localhost and in 1.43.1 it prints "::1"

Deno.serve({
  hostname: "localhost",
  onListen(details) {
    console.log(details);
  },
}, (request) => {
  return new Response(null);
})

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It also occurs on Linux and Mac: https://github.com/dsherret/dax/actions/runs/8951547585/job/24587971522

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